Meaning of CONCAVE in English

CONCAVE

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

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.