concave

[adj., v. kon-keyv, kon-keyv; n. kon-keyv] /adj., v. kɒnˈkeɪv, ˈkɒn keɪv; n. ˈkɒn keɪv/
adjective
1.
curved like a segment of the interior of a circle or hollow sphere; hollow and curved.
Compare convex (def 1).
2.
Geometry. (of a polygon) having at least one interior angle greater than 180°.
3.
Obsolete, hollow.
noun
4.
a concave surface, part, line, or thing.
5.
Machinery. a concave piece, as one against which a drum rotates.
verb (used with object), concaved, concaving.
6.
to make concave.
Origin
1375-1425; late Middle English (< Middle French) < Latin concavus, hollow. See con-, cave
Related forms
concavely, adverb
concaveness, noun
subconcave, adjective
subconcavely, adverb
subconcaveness, noun
Examples from the web for concave
  • Geodesic surfaces can be curved, zig-zag, concave-convex with each other in space.
  • The skull fragment also bore a concave imprint suggestive of a musket ball.
  • The articulating frame may also be configured to cause concave depressions similar to mechanical key caps in the surface.
  • Solid rubber outsole with concave lugs provide all-terrain grip and traction.
  • The concave buttons on the top are difficult to distinguish.
  • Cove molding has only one curve forming a concave profile.
  • They come in nine positive-negative pairs: one with a convex top and a drainage trough around the rim, the other concave.
  • concave interior surfaces add to a sense of spaciousness.
  • Where the ablution room is convex, the school curve is concave.
  • Good pans have a slightly concave bottom that flattens out when heated.
British Dictionary definitions for concave

concave

/ˈkɒnkeɪv; kɒnˈkeɪv/
adjective
1.
curving inwards
2.
(physics) having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etc: a concave lens
3.
(maths) (of a polygon) containing an interior angle greater than 180°
4.
an obsolete word for hollow
verb
5.
(transitive) to make concave
Compare convex
Derived Forms
concavely, adverb
concaveness, noun
Word Origin
C15: from Latin concavus arched, from cavus hollow
Word Origin and History for concave
adj.

early 15c., from Old French concave (14c.) or directly from Latin concavus "hollow, arched, vaulted, curved," from com-, intensive prefix (see com-), + cavus "hollow" (see cave (n.)).

concave in Medicine

concave con·cave (kŏn-kāv', kŏn'kāv')
adj.
Curved like the inner surface of a sphere. n.
A concave surface, structure, or line.

concave in Science
concave
  (kŏn'kāv')   
Curved inward, like the inside of a circle or sphere.