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Merriam-Webster's Collegiate Dictionary con·cave
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
DATE 1552 : a concave line or surface English Etymology concave 1570s, from L. concavus "hollow," from com- intensive prefix + cavus "hollow" (see cave (n.)). Oxford Advanced Learner's Dictionary-牛津双解-OALD7 concave con·cave / kCn5keiv; NAmE kB:n5k-; 5kB:n- / adjective (of an outline or a surface 轮廓或表面) curving in 凹的；凹面的: a concave lens / mirror 凹透镜；凹镜 OPP convex OLT concave adj. ⇨ curved Webster's Third New International Dictionary, Unabridged con·cave I. \ˈkänˌkāv, esp Brit sometimes -äŋˌ-\ noun (-s) Etymology: Middle French, from concave, adjective 1. a. : a hollow within a mass or in a surface < Vulcan … splits the cliff and discloses a concave fashioned by his art — E.K.Chambers > b. : a curved recess : a depression resembling a bowl c. obsolete : the bore of a gun 2. a. : the inner face of a bowl-shaped structure b. : the vault of the sky 3. obsolete : a concave lens or mirror 4. : a set of bars bearing teeth, rasps, or rubber facing curved partly around a rotating threshing cylinder as an aid in shelling grain or seeds in a thresher II. \(ˈ) ̷ ̷| ̷ ̷\ adjective Etymology: Middle French, from Latin concavus, from com- + cavus hollow — more at cave 1. obsolete : having a hollow interior < concave … as a worm-eaten nut — Shakespeare > 2. a. : hollowed or rounded inward like the inside of a bowl b. : having a shape that is thought of as curving inward — opposed to convex 3. : 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; opposed to convex • con·cave·ly adverb • con·cave·ness noun -es III. verb (-ed/-ing/-s) transitive verb : to make concave intransitive verb : to curve concavely IV. noun : a concave line or surface |
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