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# convex

[adjective kon-veks, kuh n-; noun kon-veks] /adjective kɒnˈvɛks, kən-; noun ˈkɒn vɛks/
1.
having a surface that is curved or rounded outward.
Compare concave (def 1).
2.
Mathematics.
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.
noun
3.
a convex surface, part, or thing.
Origin of convex
1565-1575
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for convex
Contemporary Examples
• A convex lens is fixated on a slanted ceiling emanating a faint amount of soft white light.

October 10, 2013
Historical Examples
• On these, magnified by their convex lenses of water, we pounced.

• The globe at last became concave, then, after they entered its atmosphere, convex.

Anthony Gilmore
• The pileus is fleshy, convex, then expanded, and at length depressed.

M. E. Hard
• Pileus fleshy, convex, glabrous, grayish-red or chestnut-color.

M. E. Hard
• The lamplight was reflected at a single point from its convex surface.

Various
• The head of the arch is wavy and formed mostly of convex curves.

Walter Crum Watson
• Then, drawing it out, a convex slit was shown in the elastic turf.

Noah Brooks
• The kind of lens we have been talking about is the convex lens.

Carleton W. Washburne
• The convex lens makes a clear image and it is the only kind of lens that will do this.

Carleton W. Washburne
British Dictionary definitions for convex

## convex

/ˈkɒnvɛks; kɒnˈvɛks/
1.
curving or bulging outwards
2.
(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
3.
(maths) (of a polygon) containing no interior angle greater than 180°
verb
4.
(transitive) to make convex
Compare concave
Derived Forms
Word Origin
C16: from Latin convexus vaulted, rounded
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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
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convex in Science
 convex   (kŏn'věks')    Curving outward, like the outer boundary of a circle or sphere.
The American Heritage® Science Dictionary
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### Difficulty index for convex

Many English speakers likely know this word

### Word Value for convex

18
21
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