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English definition of “concave”

concave

adjective     /ˈkɒŋ.keɪv/ US  /ˈkɑːn-/
curving in: a concave lens → Compare convexProperties of circles and curves concavity     /ˌkɒnˈkæv.ɪ.ti/ US  /ˌkɑːn.kæv.ə.t̬i/ noun [C or U]
(Definition of concave adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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