释义 |
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 |