[ L., from quattuor four. See Four. ] A combining form meaning four, four times, fourfold; as, quadricapsular, having four capsules. [ 1913 Webster ]

a. [ Quadri- + basic. ] (Chem.) Same as Tetrabasic. [ 1913 Webster ]

a. Quadrable. [ R. ] [ 1913 Webster ]

a. (Math.) Of or pertaining to the second degree. [ 1913 Webster ]

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. [ 1913 Webster ]

a. [ Quadri- + capsular. ] (Bot.) Having four capsules. [ 1913 Webster ]

‖n. [ NL., fr. L. qyattuor four + caput head. ] (Anat.) The great extensor muscle of the knee, divided above into four parts which unite in a single tendon at the knee. [ 1913 Webster ]

n. (Anat.) Of or pertaining to the quadriceps. [ 1913 Webster ]

n. [ See Quadricornous. ] (Zool.) Any quadricornous animal. [ 1913 Webster ]

a. [ Quadri- + L. cornu horn: cf. F. quadricorne. ] (Zool.) Having four horns, or hornlike organs; as, a quadricornous beetle. [ 1913 Webster ]

a. [ Quadri- + costate. ] Having four ribs. [ 1913 Webster ]

a. [ Quadri- + dentate. ] Having four teeth; as, a quadridentate leaf. [ 1913 Webster ]

a. Same as Quadrennial. [ 1913 Webster ]

a. [ L. quadrifarius fourfold, fr. quattuor four: cf. F. quadrifarié. Cf. Multifarious. ] Arranged in four rows or ranks; as, quadrifarious leaves. Loudon. [ 1913 Webster ]

a. [ L. quadrifidus; quattuor four + findere to cleave: cf. F. quadrifide. ] Divided, or deeply cleft, into four parts; as, a quadrifid perianth; a quadrifid leaf. [ 1913 Webster ]

{ } a. [ Quadri- + L. folium leaf. ] (Bot.) Four-leaved; having the leaves in whorls of four. [ 1913 Webster ]

a. [ Quadri- + furcated. ] Having four forks, or branches. [ 1913 Webster ]

‖n.; pl. Quadrigæ [ L. See Quadrijugous. ] (Rom. Antiq.) A car or chariot drawn by four horses abreast. [ 1913 Webster ]

{ } a. [ Quadri- + L. gemini twins. ] Fourfold; having four similar parts, or two pairs of similar parts. [ 1913 Webster ]

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. [ 1913 Webster ]

a. [ L. quadrigeni, quadringeni, four hundred each. ] Consisting of four hundred. [ 1913 Webster ]

a. Same as Quadrijugous. [ 1913 Webster ]

a. [ L. quadrijugus of a team of four; quattuor four + jugum yoke. ] (Bot.) Pinnate, with four pairs of leaflets; as, a quadrijugous leaf. [ 1913 Webster ]

a. [ L. quadrilaterus: cf. F. quadrilatère, quadrilatéral. See Quadri- and Lateral. ] Having four sides, and consequently four angles; quadrangular. [ 1913 Webster ]

n. 1. (Geom.) A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines. [ 1913 Webster ]

2. An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano. [ 1913 Webster ]

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. [ 1913 Webster ]

n. The property of being quadrilateral. [ 1913 Webster ]

a. [ Quadri- + literal. ] Consisting of four letters. [ 1913 Webster ]

a. [ F. ] (Art) Marked with squares, generally by thin lines crossing at right angles and at equal intervals; as, quadrillé paper, or plotting paper. [ Webster 1913 Suppl. ]

n. [ 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. [ 1913 Webster ]

2. The appropriate music for a quadrille. [ 1913 Webster ]

n. [ F. quadrille, n. masc., cf. It. quadriglio; or perhaps from the Spanish. See Quadrille a dance. ] 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. [ 1913 Webster ]

n. [ F., fr. L. quater four times, akin to quattuor four, E. four; -- formed like million. See Four, Million. ] 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. [ 1913 Webster ]

{ } a. [ Quadri- + lobe: cf. F. quadrilobé. ] Having four lobes; as, a quadrilobate leaf. [ 1913 Webster ]

a. [ Quadri- + locular: cf. F. quadriloculaire. ] Having four cells, or cavities; as, a quadrilocular heart. [ 1913 Webster ]

n. [ OF., fr. L. quadrini four each, fr. quattuor four. ] A small piece of money, in value about a farthing, or a half cent. [ Obs. ] [ 1913 Webster ]

a. [ Quadri- + nodal. ] (Math.) Possessing four nodes; as, quadrinodal curves. [ 1913 Webster ]

n. [ Quadri- + nomial, as in binomial: cf. F. quadrinôme. ] (Alg.) A polynomial of four terms connected by the signs plus or minus. [ 1913 Webster ]

a. Quadrinomial. [ 1913 Webster ]

a. [ Quadri- + nominal. ] (Alg.) Quadrinomial. Sir W. R. Hamilton. [ 1913 Webster ]

a. [ L. quadripartitus, p. p. of quadripartire to divide into four parts; quattuor four + partire to divide: cf. F. quadripartite. ] Divided into four parts. [ 1913 Webster ]

adv. In four parts. [ 1913 Webster ]

n. [ L. quadripartitio: cf. F. quadripartition. ] A division or distribution by four, or into four parts; also, a taking the fourth part of any quantity or number. [ 1913 Webster ]

a. [ Quadri- + pennate. ] (Zool.) Having four wings; -- said of insects. [ 1913 Webster ]

a. [ Quadri + Gr. &unr_; leaf. ] (Bot.) Having four leaves; quadrifoliate. [ 1913 Webster ]

n. [ L. quadriremis; quattuor four + remus an oar: cf. F. quadrirème. ] (Antiq.) A galley with four banks of oars or rowers. [ 1913 Webster ]

n. [ Quadri- + section. ] A subdivision into four parts. [ 1913 Webster ]

a. [ Quadri + sulcate. ] (Zool.) Having four hoofs; as, a quadrisulcate foot; a quadrisulcate animal. [ 1913 Webster ]

{ }Having four syllables; of or pertaining to quadrisyllables; as, a quadrisyllabic word. [ 1913 Webster ]

n. [ Quadri- + syllable: cf. F. quadrisyllabe. ] A word consisting of four syllables. De Quincey. [ 1913 Webster ]

n. (Chem.) The quality or state of being quadrivalent; tetravalence. [ 1913 Webster ]

a. [ Quadri- + L. valens, -entis, p. pr. See Valence. ] (Chem.) 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. [ 1913 Webster ]

a. [ Quadri- + valve: cf. F. quadrivalve. ] (Bot.) Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp. [ 1913 Webster ]