[ adjective kon-veks, kuh n-; noun kon-veks ]
/ adjective kɒnˈvɛks, kən-; noun ˈkɒn vɛks /


having a surface that is curved or rounded outward.Compare concave(def 1).
  1. (of a polygon) having all interior angles less than or equal to 180°.
  2. (of a set) having the property that for each pair of points in the set the line joining the points is wholly contained in the set.


a convex surface, part, or thing.

Nearby words

  1. convertible lens,
  2. convertible preferred stock,
  3. convertin,
  4. convertiplane,
  5. convertite,
  6. convex hull,
  7. convex lens,
  8. convex sole,
  9. convexity,
  10. convexo-

Origin of convex

1565–75; < Latin convexus equivalent to con- con- + -vexus, perhaps < *wek-sos, derivative of base of vehere to convey, if original sense was “brought together (to a single point)”

Related formscon·vex·ly, con·vex·ed·ly [kuh n-vek-sid-lee] /kənˈvɛk sɪd li/, adverbcon·vex·ed·ness, nounsub·con·vex, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for convex

British Dictionary definitions for convex


/ (ˈkɒnvɛks, kɒnˈvɛks) /


curving or bulging outwards
physics having one or two surfaces curved or ground in the shape of a section of the exterior of a sphere, paraboloid, ellipsoid, etca convex lens
maths (of a polygon) containing no interior angle greater than 180°


(tr) to make convex
Compare concave

Derived Formsconvexly, adverb

Word Origin for convex

C16: from Latin convexus vaulted, rounded

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 convex



1570s, from Middle French convexe, from Latin convexus "vaulted, arched," past participle of convehere "to bring together," from com- "together," or "thoroughly" (see com-) + vehere "to bring" (see vehicle). Possibly from the idea of vaults carried together to meet at the point of a roof. Related: Convexity. Convex lens is from 1822.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for convex


[ kŏnvĕks′, kən-vĕks ]


Having a surface or boundary that curves or bulges outward, as the exterior of a sphere.
Related formscon•vexi•ty n.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for convex


[ kŏnvĕks′ ]

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