Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: convexus

convex

 adjective
     
con‧vex
curved outwards, like the surface of the eye [≠ concave]:
a convex lens
a convex mirror
—convexly adverb
—convexity noun [uncountable and countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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