English

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

 

concave

 adjective
adjective
BrE BrE//kɒnˈkeɪv//
 
; NAmE NAmE//kɑːnˈkeɪv//
 
, NAmE//ˈkɑːnkeɪv//
 
 
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(of an outline or a surface) curving in a concave lens/mirror The upper surface is slightly concave. The inside of a shiny spoon is a common example of a concave mirror. opposite convex Word Origin late Middle English: from Latin concavus, from con- ‘together’ + cavus ‘hollow’.
See the Oxford Advanced American Dictionary entry: concave