I. adjective Etymology: Middle English, from Latin concavus, from com- + cavus hollow — more at cave Date: 15th century 1. hollowed or rounded inward like the inside of a bowl 2. arched in ; curving in — used of the side of a curve or surface on which neighboring normals to the curve or surface converge and on which lies the chord joining two neighboring points of the curve or surface II. noun Date: 1552 a concave line or surface

New Collegiate Dictionary. 2001.

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  • concave — [ kɔ̃kav ] adj. • 1314; lat. concavus, de cavus « creux » → 2. cave ♦ Qui présente une courbe, une surface en creux (⇒ biconcave). Surface, miroir concave. Moulure concave. ⇒ cavet. ⊗ CONTR. Bombé, convexe. ● concave adjectif ( …   Encyclopédie Universelle

  • concave — Concave. adjectif de tout genre, Creux en rond. Il est opposé à convexe. Le ciel est concave à nostre esgard. miroir concave. la superficie concave. d un globe. Concave. s. m. La superficie interieure d un corps spherique qui est creux. Le… …   Dictionnaire de l'Académie française

  • Concave — Con cave (k[o^][ng]*k[=a]*v or k[o^]n ; 277), a. [L. concavus; con + cavus hollow: cf. F. concave. See {Cave} a hollow.] 1. Hollow and curved or rounded; vaulted; said of the interior of a curved surface or line, as of the curve of the of the… …   The Collaborative International Dictionary of English

  • concave — CONCAVE. adj des 2 genr. Il se dit d Une surface ou d une circonférence courbe, prise du côté qu elle est capable de contenir quelque chose. Il est opposé à convexe. Miroir concave. Il est aussi substantif. Le concave d un globe …   Dictionnaire de l'Académie Française 1798

  • concave — [kän kāv′; ] also, & for n.usually [, kän′kāv΄] adj. [ME & OFr < L concavus, hollow < com , intens. + cavus, hollow: see CAVE] hollow and curved like the inside of a bowl n. a concave surface, line, object, etc.: see LENS vt. concaved,… …   English World dictionary

  • Concave — Con cave, n. [L. concavum.] 1. A hollow; an arched vault; a cavity; a recess. [1913 Webster] Up to the fiery concave towering hight. Milton. [1913 Webster] 2. (Mech.) A curved sheath or breasting for a revolving cylinder or roll. [1913 Webster] …   The Collaborative International Dictionary of English

  • Concave — Con cave, v. t. [imp. & p. p. {concaved}; p. pr. & vb. n. {Concaving}.] To make hollow or concave. [1913 Webster] …   The Collaborative International Dictionary of English

  • concave — early 15c., from O.Fr. concave (14c.) or directly from L. concavus hollow, arched, vaulted, curved, from com , intensive prefix (see COM (Cf. com )), + cavus hollow (see CAVE (Cf. cave) (n.)) …   Etymology dictionary

  • concave — means ‘having an outline or surface like the interior of a circle or sphere’, whereas convex means ‘having an outline or surface like the exterior of a circle or sphere’ …   Modern English usage

  • concave — [adj] curved, depressed biconcave, cupped, dented, dimpled, dipped, excavated, hollow, hollowed, incurvate, incurvated, incurved, indented, round, rounded, sagging, scooped, sinking, sunken; concept 486 Ant. convex, distended …   New thesaurus

  • concave — ► ADJECTIVE ▪ having an outline or surface that curves inwards like the interior of a sphere. Compare with CONVEX(Cf. ↑convexly). DERIVATIVES concavity noun. ORIGIN Latin concavus, from cavus hollow …   English terms dictionary

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