[adjective, verb kon-keyv, kon-keyv; noun kon-keyv]
Geometry. (of a polygon) having at least one interior angle greater than 180°.
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.
Origin of concave
1375–1425; late Middle EnglishRelated formscon·cave·ly, adverbcon·cave·ness, nounsub·con·cave, adjectivesub·con·cave·ly, adverbsub·con·cave·ness, noun
(< Middle French
) < Latin concavus,
hollow. See con-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for concavedipped
Examples from the Web for concave
Historical Examples of concave
British Dictionary definitions for concave
Derived Formsconcavely, adverbconcaveness, noun
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°
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
Word Origin and History for concave
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.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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.
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.