9 Grammatical Pitfalls


[adj. kon-veks, kuh n-; n. kon-veks] /adj. kɒnˈvɛks, kən-; n. 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.
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 forms
convexly, convexedly
[kuh n-vek-sid-lee] /kənˈvɛk sɪd li/ (Show IPA),
convexedness, noun
subconvex, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for convex
  • Shaping the hyperbolic, convex curve of the secondary mirror proved troublesome.
  • Again, the deeply modeled convex surfaces are backed by smoothed-out flat planes.
  • Its ilium is distinctive, being dorsally convex in profile and with a thick dorsal margin.
  • They come in nine positive-negative pairs: one with a convex top and a drainage trough around the rim, the other concave.
  • The mirrors work on the same principal as those big convex mirrors mounted at the corners of large parking garages.
  • The way he contrasts convex shapes with concave ones also stays in memory.
  • In other places, he could learn about convex shapes from yellowed bulges near the ceiling.
  • Rear visibility isn't great, but small convex side mirrors and an optional rear-view camera help.
  • The convex canvas was flattened against the wall behind it, and many of the remnants of the tattered blue sky were shorn off.
  • There's a three-dimensional, convex quality to the image.
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, etc: a convex lens
(maths) (of a polygon) containing no interior angle greater than 180°
(transitive) to make convex
Compare concave
Derived Forms
convexly, adverb
Word Origin
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
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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
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convex in Medicine

convex con·vex (kŏn'věks', kən-věks')
Having a surface or boundary that curves or bulges outward, as the exterior of a sphere.

con·vex'i·ty n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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convex in Science
Curving outward, like the outer boundary of a circle or sphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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