Meaning of CONCAVE in English

CONCAVE

/ kɒnˈkeɪv; NAmE kɑːnˈk-; ˈkɑːn-/ adjective

( of an outline or a surface ) curving in :

a concave lens / mirror

OPP convex

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WORD ORIGIN

late Middle English : from Latin concavus , from con- together + cavus hollow.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.