[ adjective, verb kon-keyv, kon-keyv; noun kon-keyv ]
/ adjective, verb kɒnˈkeɪv, ˈkɒn keɪv; noun ˈkɒn keɪv /


curved like a segment of the interior of a circle or hollow sphere; hollow and curved.Compare convex(def 1).
Geometry. (of a polygon) having at least one interior angle greater than 180°.
Obsolete. hollow.


a concave surface, part, line, or thing.
Machinery. a concave piece, as one against which a drum rotates.

verb (used with object), con·caved, con·cav·ing.

to make concave.

Origin of concave

1375–1425; late Middle English (< Middle French) < Latin concavus, hollow. See con-, cave

OTHER WORDS FROM concave Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for concave

British Dictionary definitions for concave

/ (ˈkɒnkeɪv, kɒnˈkeɪv) /


curving inwards
physics having one or two surfaces curved or ground in the shape of a section of the interior of a sphere, paraboloid, etca concave lens
maths (of a polygon) containing an interior angle greater than 180°
an obsolete word for hollow


(tr) to make concave
Compare convex

Derived forms of concave

concavely, adverbconcaveness, noun

Word Origin for concave

C15: from Latin concavus arched, from cavus hollow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for concave

[ kŏn-kāv, kŏnkāv′ ]


Curved like the inner surface of a sphere.


A concave surface, structure, or line.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for concave

[ kŏnkāv′ ]

Curved inward, like the inside of a circle or sphere.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.