American English

Definition of concave adjective from the Oxford Advanced American Dictionary

 

concave

 adjective
adjective
NAmE//kɑnˈkeɪv//
 
, NAmE//ˈkɑnkeɪv//
 
 
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(of an outline or a surface) curving in a concave lens/mirror opposite convex
See the Oxford Advanced Learner's Dictionary entry: concave