English

Definition of convex adjective from the Oxford Advanced Learner's Dictionary

 

convex

 adjective
adjective
BrE BrE//ˈkɒnveks//
 
; NAmE NAmE//ˈkɑːnveks//
 
 
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(of an outline or a surface) curving out a convex lens/mirror opposite concave Word Origin late 16th cent.: from Latin convexus ‘vaulted, arched’.Extra examples The surface is slightly convex. A convex lens is thicker at its centre than at its edges. A reflection in a convex mirror is smaller than the same reflection in a flat mirror.
See the Oxford Advanced American Dictionary entry: convex