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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
late Middle English
1375-1425
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sub 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
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
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Word Origin and History for sub concave
concave
1570s, from L. concavus "hollow," from com- intensive prefix + cavus "hollow" (see cave (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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sub 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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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sub concave in Science
concave
  (kŏn'kāv')   
Curved inward, like the inside of a circle or sphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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