concave
adjective/kɒnˈkeɪv/
/kɑːnˈkeɪv/
- (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.
Oxford Collocations DictionaryConcave is used with these nouns:- mirror
Word Originlate Middle English: from Latin concavus, from con- ‘together’ + cavus ‘hollow’.Want to learn more?
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concave