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QUA-BIRD Qua-bird`, n. (Zo?l.) Defn: The American night heron. See under Night.

QUAB Quab, n. Etym: [Cf. D. kwab eelpout, Dan. quabbe, G. quabbe, quappe,

QUAB Quab, v. i. Defn: See Quob, v. i.

QUACHA Quacha, n. (Zo?l.) Defn: The quagga.

QUACK Quack, v. i. [imp. & p. p. Qvacked; p. pr. & vb. n. Quacking.] Etym: [Of imitative origin; cf. D. kwaken, G. quacken, quaken, Icel. kvaka to twitter.] 1. To utter a sound like the cry of a duck. 2. To make vain and loud pretensions; to boast. To quack of universal cures. Hudibras. 3. To act the part of a quack, or pretender.

QUACK Quack, n. 1. The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise. Chaucer. 2. Etym: [Cf. Quacksalver.] Defn: A boastful pretender to medical skill; an empiric; an ignorant practitioner. 3. Hence, one who boastfully pretends to skill or knowledge of any kind not possessed; a charlatan. Quacks political; quacks scientific, academical. Carlyle.

QUACK Quack, a. Defn: Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.

QUACK GRASS Quack grass`. (Bot.) Defn: See Quitch grass.

QUACKERY Quacker*y, n.; pl. Quackeries (. Defn: The acts, arts, or boastful pretensions of a quack; false pretensions to any art; empiricism. Carlyle.

QUACKISH Quackish, a. Defn: Like a quack; boasting; characterized by quackery. Burke.

QUACKISM Quackism, n. Defn: Quackery. Carlyle.

QUACKLE Quackle, v. i. & t. [imp. & p. p. Quackled; p. pr. & vb. n. Quackling.] Etym: [Cf.Querken.] Defn: To suffocate; to choke. [Prov. Eng.]

QUACKSALVER Quacksal*ver, n. Etym: [D. kwakzalver; cf. kwakzalven to quack or boast of one's salves. See Quack, Salve, n.] Defn: One who boasts of his skill in medicines and salves, or of the efficacy of his prescriptions; a charlatan; a quack; a mountebank. [Obs.] Burton.

QUAD Quad, n. (Print.) Defn: A quadrat.

QUAD Quad, n. (Arch.) Defn: A quadrangle; hence, a prison. [Cant or Slang]

QUAD; QUADE Quad, Quade, a. Etym: [Akin to AS. cw?d, cwead, dung, evil, G. kot, dung, OHG. quat.] Defn: Evil; bad; baffling; as, a quade wind. [Obs.] Sooth play, quad play, as the Fleming saith. Chaucer.

QUADRA Quadra, n.; pl. Quadr?. Etym: [L., a square, the socle, a platband, a fillet.] (Arch.) (a) The plinth, or lowest member, of any pedestal, podium, water table, or the like. (b) A fillet, or listel.

QUADRABLE Quadra*ble, a.Etym: [See Quadrate.] (Math.) Defn: That may be sqyared, or reduced to an equivalent square; -- said of a surface when the area limited by a curve can be exactly found, and expressed in a finite number of algebraic terms.

QUADRAGENARIOUS Quad`ra*ge*nari*ous, a. Etym: [L. quadragenarius, fr. qyadrageni forty each.] Defn: Consisting of forty; forty years old.

QUADRAGENE Quadra*gene, n. Etym: [LL. quadragena, fr. L. quadrageni forty each, akin to quadraginta forty.] (R. C. Ch.) Defn: An indulgence of forty days, corresponding to the forty days of ancient canonical penance.

QUADRAGESIMA Quad`ra*gesi*ma, n. Etym: [L., fr. quadragesimus the fortieth, fr. quadraginta forty; akin to quattuor four. See Four.] (Eccl.) Defn: The forty days of fast preceding Easter; Lent. Quadragesima Sunday, the first Sunday in Lent, about forty days before Easter.

QUADRAGESIMAL Quad`ra*gesi*mal, a. Etym: [Cf. F. quadrag?simal.] Defn: Belonging to Lent; used in Lent; Lenten.

QUADRAGESIMALS Quad`ra*gesi*mals, n. pl. Defn: Offerings formerly made to the mother church of a diocese on Mid-Lent Sunday.

QUADRANGLE Quadran`gle, n. Etym: [F., fr. L. quadrangulum; quattuor four + angulus an angle. See Four, and Angle a corner.] 1. (Geom.) Defn: A plane figure having four angles, and consequently four sides; any figure having four angles. 2. A square or quadrangular space or inclosure, such a space or court surrounded by buildings, esp. such a court in a college or public school in England.

QUADRANGULAR Quad*rangu*lar, a. Etym: [Cf. F. quadrangulaire.] Defn: Having four angles, and consequently four sides; tetragonal. -- Quad*rangu*lar*ly, adv.

QUADRANS Quadrans, n.; pl. Quadrantes. Etym: [L.] 1. (Rom. Antiq.) Defn: A fourth part of the coin called an as. See 3d As, 2. 2. The fourth of a penny; a farthing. See Cur.

QUADRANT Quadrant, n. Etym: [L. quadrans, -antis, a fourth part, a fourth of a whole, fr. quattuor four: cf. F. quadrant, cadran. See Four, and cf. Cadrans.] 1. The fourth part; the quarter. [Obs.] Sir T. Browne. 2. (Geom.) Defn: The quarter of a circle, or of the circumference of a circle, an arc of 90?, or one subtending a right angle at the center. 3. (Anal. (Geom.) Defn: One of the four parts into which a plane is divided by the co?rdinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant. 4. An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90?, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction. Gunner's quadrant, an instrument consisting of a graduated limb, with a plumb line or spirit level, and an arm by which it is applied to a cannon or mortar in adjusting it to the elevation required for attaining the desired range. -- Gunter's quadrant. See Gunter's quadrant, in the Vocabulary. Hadley's quadrant, a hand instrument used chiefly at sea to measure the altitude of the sun or other celestial body in ascertaining the vessel's position. It consists of a frame in the form of an octant having a graduated scale upon its arc, and an index arm, or alidade pivoted at its apex. Mirrors, called the index glass and the horizon glass, are fixed one upon the index arm and the other upon one side of the frame, respectively. When the instrument is held upright, the index arm may be swung so that the index glass will reflect an image of the sun upon the horizon glass, and when the reflected image of the sun coincides, to the observer's eye, with the horizon as seen directly through an opening at the side of the horizon glass, the index shows the sun's altitude upon the scale; -- more properly, but less commonly, called an octant. -- Quadrant of altitude, an appendage of the artificial globe, consisting of a slip of brass of the length of a quadrant of one of the great circles of the globe, and graduated. It may be fitted to the meridian, and being movable round to all points of the horizon, serves as a scale in measuring altitudes, azimuths, etc.

QUADRANTAL Quad*rantal, a. Etym: [L. quadrantalis containing the fourth fourth part of a measure.] (Geom.) Defn: Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space. Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90?. -- Quadrantal versor, a versor that expresses rotation through one right angle.

QUADRANTAL Quad*rantal, n. Etym: [L.] 1. (Rom. Antiq.) Defn: A cubical vessel containing a Roman cubic foot, each side being a Roman square foot; -- used as a measure. 2. A cube. [R.]

QUADRAT Quadrat, n. Etym: [F. quadrat, cadrat. See Quadrate.] 1. (Print.) Defn: A block of type metal lower than the letters, -- used in spacing and in blank lines. [Abbrev. quad.] 2. An old instrument used for taking altitudes; -- called also geometrical square, and line of shadows.

QUADRATE Quadrate, a. Etym: [L. quadratus squared, p. p. of quadrare to make four-cornered, to make square, to square, to fit, suit, from quadrus square, quattuor four. See Quadrant, and cf. Quadrat, Quarry an arrow, Square.] 1. Having four equal sides, the opposite sides parallel, and four right angles; square. Figures, some round, some triangle, some quadrate. Foxe. 2. Produced by multiplying a number by itself; square. Quadrate and cubical numbers. Sir T. Browne. 3. Square; even; balanced; equal; exact. [Archaic] A quadrate, solid, wise man. Howell. 4. Squared; suited; correspondent. [Archaic] A generical description quadrate to both. Harvey. Quadrate bone (Anat.), a bone between the base of the lower jaw and the skull in most vertebrates below the mammals. In reptiles and birds it articulates the lower jaw with the skull; in mammals it is represented by the malleus or incus.

QUADRATE Quadrate, n. Etym: [L. quadratum. See Quadrate, a.] 1. (Geom.) Defn: A plane surface with four equal sides and four right angles; a square; hence, figuratively, anything having the outline of a square. At which command, the powers militant That stood for heaven, in mighty quadrate joined. Milton. 2. (Astrol.) Defn: An aspect of the heavenly bodies in which they are distant from each other 90?, or the quarter of a circle; quartile. See the Note under Aspect, 6. 3. (Anat.) Defn: The quadrate bone.

QUADRATE Quadrate, v. i. [imp. & p. p. Quadrated; p. pr. & vb. n. Quadrating.] Etym: [See Quadrate, a.] Defn: To square; to agree; to suit; to correspond; -- followed by with. [Archaic] The objections of these speculatists of its forms do not quadrate with their theories. Burke.

QUADRATE Quadrate, v. t. Defn: To adjust (a gun) on its carriage; also, to train (a gun) for horizontal firing.

QUADRATIC Quad*ratic, a. Etym: [Cf. F. quadratique.] 1. Of or pertaining to a square, or to squares; resembling a quadrate, or square; square. 2. (Crystallog.) Defn: Tetragonal. 3. (Alg.) Defn: Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square.

QUADRATICS Quad*ratics, n. (Alg.) Defn: That branch of algebra which treats of quadratic equations.

QUADRATOJUGAL Quad*ra`to*jugal, a. (Anat.) (a) Of or pertaining to the quadrate and jugal bones. (b) Of or pertaining to the quadratojugal bone. -- n. Defn: The quadratojugal bone. Quadratojugal bone (Anat.), a bone at the base of the lower jaw in many animals.

QUADRATRIX Quad*ratrix, n.; pl. -trixes, or -trices. Etym: [NL.] (Geom.) Defn: A curve made use of in the quadrature of other curves; as the quadratrix, of Dinostratus, or of Tschirnhausen.

QUADRATURE Quadra*ture, n. Etym: [L. quadratura: cf. F. quadrature. See Quadrate, a.] 1. (Math.) Defn: The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas. 2. A quadrate; a square. Milton. 3. (Integral Calculus) Defn: The integral used in obtaining the area bounded by a curve; hence, the definite integral of the product of any function of one variable into the differential of that variable. 4. (Astron.) Defn: The position of one heavenly body in respect to another when distant from it 90?, or a quarter of a circle, as the moon when at an equal distance from the points of conjunction and opposition. Quadrature of the moon (Astron.), the position of the moon when one half of the disk is illuminated. -- Quadrature of an orbit (Astron.), a point in an orbit which is at either extremity of the latus rectum drawn through the empty focus of the orbit.

QUADREL Quadrel, n. Etym: [It. quadrello, LL. quadrellus, fr. L. quadrus square. See Quadrate, and cf. Quarrel an arrow.] 1. A square piece of turf or peat. [Prov. Eng.] 2. A square brick, tile, or the like.

QUADRENNIAL Quad*renni*al, a. Etym: [L. quadriennium a space of four years; quattuor four + annus year; cf. L. quadriennis. See Quadrate, and Annual.] 1. Comprising four years; as, a quadrennial period. 2. Occurring once in four years, or at the end of every four years; as, quadrennial games.

QUADRENNIALLY Quad*renni*al*ly, adv. Defn: Once in four years.

QUADRENNIUM Quad*renni*um, n. Etym: [NL. See Quadrennial.] Defn: A space or period of four years.

QUADRI- Quadri-. Etym: [L., from quattuor four. See Four.] Defn: A combining form meaning four, four times, fourfold; as, quadricapsular, having four capsules.

QUADRIBASIC Quad`ri*basic, a. Etym: [Quadri- + basic.] (Chem.) Defn: Same as Tetrabasic.

QUADRIBLE Quadri*ble, a. Defn: Quadrable. [R.]

QUADRIC Quadric, a. (Math.) Defn: Of or pertaining to the second degree.

QUADRIC Quadric, n. (a) (Alg.) A quantic of the second degree. See Quantic. (b) (Geom.) A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics.

QUADRICAPSULAR Quad`ri*capsu*lar, a. Etym: [Quadri- + capsular.] (Bot.) Defn: Having four capsules.

QUADRICEPS Quadri*ceps, n. Etym: [NL., fr. L. qyattuor four + caput head.] (Anat.) Defn: The great extensor muscle of the knee, divided above into four parts which unite in a single tendon at the knee.

QUADRICIPITAL Quad`ri*cipi*tal, n. (Anat.) Defn: Of or pertaining to the quadriceps.

QUADRICORN Quadri*corn, n. Etym: [See Quadricornous.] (Zo?l.) Defn: Any quadricornous animal.

QUADRICORNOUS Quad`ri*cornous, a. Etym: [Quadri- + L. cornu horn: cf. F. quadricorne.] (Zo?l.) Defn: Having four horns, or hornlike organs; as, a quadricornous beetle.

QUADRICOSTATE Quad`ri*costate, a. Etym: [Quadri- + costate.] Defn: Having four ribs.

QUADRIDENTATE Quad`ri*dentate, a. Etym: [Quadri- + dentate.] Defn: Having four teeth; as, a quadridentate leaf.

QUADRIENNIAL Quad`ri*enni*al, a. Defn: Same as Quadrennial.

QUADRIFARIOUS Quad`ri*fari*ous, a. Etym: [L. quadrifarius fourfold, fr. quattuor four: cf. F. quadrifari?. Cf. Multifarious.] Defn: Arranged in four rows or ranks; as, quadrifarious leaves. Loudon.

QUADRIFID Quadri*fid, a. Etym: [L. quadrifidus; quattuor four + findere to cleave: cf. F. quadrifide.] Defn: Divided, or deeply cleft, into four parts; as, a quadrifid perianth; a quadrifid leaf.

QUADRIFOIL; QUADRIFOLIATE Quadri*foil, Quad`ri*foli*ate, a. Etym: [Quadri- + L. folium leaf.] (Bot.) Defn: Four-leaved; having the leaves in whorls of four.

QUADRIFURCATED Quad`ri*furca*ted, a. Etym: [Quadri- + furcated.] Defn: Having four forks, or branches.

QUADRIGA Quad*riga, n.; pl. Quadrig?. Etym: [L. See Quadrijugous.] (Rom. Antiq.) Defn: A car or chariot drawn by four horses abreast.

QUADRIGEMINAL; QUADRIGEMINOUS Quad`ri*gemi*nal, Quad`ri*gemi*nous, a. Etym: [Quadri- + L. gemini twins.] Defn: Fourfold; having four similar parts, or two pairs of similar parts. Quadrigeminal bodies (Anat.), two pairs of lobes, or elevations, on the dorsal side of the midbrain of most mammals; the optic lobes. The anterior pair are called the nates, and the posterior the testes.

QUADRIGENARIOUS Quad`ri*ge*nari*ous, a. Etym: [L. quadrigeni, quadringeni, four hundred each.] Defn: Consisting of four hundred.

QUADRIJUGATE Quad*riju*gate, a. Defn: Same as Quadrijugous.

QUADRIJUGOUS Quad*riju*gous, a. Etym: [L. quadrijugus of a team of four; quattuor four + jugum yoke.] (Bot.) Defn: Pinnate, with four pairs of leaflets; as, a quadrijugous leaf.

QUADRILATERAL Quad`ri*later*al, a. Etym: [L. quadrilaterus: cf. F. quadrilat?re, quadrilat?ral. See Quadri- and Lateral.] Defn: Having four sides, and consequently four angles; quadrangular.

QUADRILATERAL Quad`ri*later*al, n. 1. (Geom.) Defn: A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. 2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. Complete quadrilateral (Geom.), the figure made up of the six straight lines that can be drawn through four points, A., B, C, I, the lines being supposed to be produced indefinitely.

QUADRILATERALNESS Quad`ri*later*al*ness, n. Defn: The property of being quadrilateral.

QUADRILITERAL Quad`ri*liter*al, a. Etym: [Quadri- + literal.] Defn: Consisting of four letters.

QUADRILLE Qua*drille, n. Etym: [F. quadrille, n. fem., fr. Sp. cuadrilla meeting of four or more persons or It. quadriglia a band of soldiers, a sort of dance; dim. fr. L. quadra a square, fr. quattuor four. See Quadrate.] 1. A dance having five figures, in common time, four couples of dancers being in each set. 2. The appropriate music for a quadrille.

QUADRILLE Qua*drille, n. Etym: [F. quadrille, n. masc., cf. It. quadriglio; or perhaps from the Spanish. See Quadrille a dance.] Defn: A game played by four persons with forty cards, being the remainder of an ordinary pack after the tens, nines, and eights are discarded. Hoyle.

QUADRILLION Quad*rillion, n. Etym: [F., fr. L. quater four times, akin to quattuor four, E. four; -- formed like million. See Four, Million.] Defn: According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under Numeration.

QUADRILOBATE; QUADRILOBED Quad`ri*lobate, Quad`ri*lobed, a. Etym: [Quadri- + lobe: cf. F. quadrilob?.] Defn: Having four lobes; as, a quadrilobate leaf.

QUADRILOCULAR Quad`ri*locu*lar, a. Etym: [Quadri- + locular: cf. F. quadriloculaire.] Defn: Having four cells, or cavities; as, a quadrilocular heart.

QUADRIN Quadrin, n. Etym: [OF., fr. L. quadrini four each, fr. quattuor four.] Defn: A small piece of money, in value about a farthing, or a half cent. [Obs.]

QUADRINODAL Quad`ri*nodal, a. Etym: [Quadri- + nodal.] (Math.) Defn: Possessing four nodes; as, quadrinodal curves.

QUADRINOMIAL Quad`ri*nomi*al, n. Etym: [Quadri- + nomial, as in binomial: cf. F. quadrin?me.] (Alg.) Defn: A polynomial of four terms connected by the signs plus or minus.

QUADRINOMICAL Quad`ri*nomic*al, a. Defn: Quadrinomial.

QUADRINOMINAL Quad`ri*nomi*nal, a. Etym: [Quadri- + nominal.] (Alg.) Defn: Quadrinomial. Sir W. R. Hamilton.

QUADRIPARTITE Quad*ripar*tite, a. Etym: [L. quadripartitus, p. p. of quadripartire to divide into four parts; quattuor four + partire to divide: cf. F. quadripartite.] Defn: Divided into four parts.

QUADRIPARTITELY Quad*ripar*tite*ly, adv. Defn: In four parts.

QUADRIPARTITION Quad`ri*par*tition, n. Etym: [L. quadripartitio: cf. F. quadripartition.] Defn: A division or distribution by four, or into four parts; also, a taking the fourth part of any quantity or number.

QUADRIPENNATE Quad`ri*pennate, a. Etym: [Quadri- + pennate.] (Zo?l.) Defn: Having four wings; -- said of insects.

QUADRIPHYLLOUS Quad*riphyl*lous, a. Etym: [Quadri + Gr. (Bot.) Defn: Having four leaves; quadrifoliate.

QUADRIREME Quadri*reme, n. Etym: [L. quadriremis; quattuor four + remus an oar: cf. F. quadrir?me.] (Antiq.) Defn: A galley with four banks of oars or rowers.

QUADRISECTION Quad`ri*section, n. Etym: [Quadri- + section.] Defn: A subdivision into four parts.

QUADRISULCATE Quad`ri*sulcate, a. Etym: [Quadri + sulcate.] (Zo?l.) Defn: Having four hoofs; as, a quadrisulcate foot; a quadrisulcate animal.

QUADRISYLLABIC; QUADRI-SYLLABICAL Quad`ri*syl*labic, Quad`ri-syl*labic*al, Defn: Having four syllables; of or pertaining to quadrisyllables; as, a quadrisyllabic word.

QUADRISYLLABLE Quad`ri*sylla*ble, n. Etym: [Quadri- + syllable: cf. F. quadrisyllabe.] Defn: A word consisting of four syllables. De Quincey.

QUADRIVALENCE Quad*riva*lence, n. (Chem.) Defn: The quality or state of being quadrivalent; tetravalence.

QUADRIVALENT Quad*riva*lent, a. Etym: [Quadri- + L. valens, -entis, p. pr. See Valence.] (Chem.) Defn: Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent; -- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements.

QUADRIVALVE Quadri*valve, a. Etym: [Quadri- + valve: cf. F. quadrivalve.] (Bot.) Defn: Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp.

QUADRIVALVE Quadri*valve, n. (Arch.) Defn: A door, shutter, or the like, having four folds.

QUADRIVALVULAR Quad`ri*valvu*lar, a. Defn: Having four valves; quadrivalve.

QUADRIVIAL Quad*rivi*al, a. Etym: [L. quadrivium a place where four ways meet; quattuor four + via way.] Defn: Having four ways meeting in a point. B. Jonson.

QUADRIVIAL Quad*rivi*al, n. Defn: One of the four liberal arts making up the quadrivium.

QUADRIVIUM Quad*rivi*um, n. Etym: [L.] Defn: The four liberal arts, arithmetic, music, geometry, and astronomy; -- so called by the schoolmen. See Trivium.

QUADROON Quad*roon, n. Etym: [F. quarteron, or Sp. cuarteron. See Quarter a fourth part, and cf. Quarteron.] Defn: The offspring of a mulatto and a white person; a person quarter-blooded. [Written also quarteron, quarteroon, and quateron.]

QUADROXIDE Quad*roxide, n. Etym: [Quadri- + oxide.] (Chem.) Defn: A tetroxide. [R.]

QUADRUMANA Quad*ruma*na, n. pl. Etym: [NL. See Quadrumane.] (Zo?l.) Defn: A division of the Primates comprising the apes and monkeys; -- so called because the hind foot is usually prehensile, and the great toe opposable somewhat like a thumb. Formerly the Quadrumana were considered an order distinct from the Bimana, which last included man alone.

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