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concave▼(curved inward)adjective[UK: ˈkɒŋk.eɪv] [US: kanˈkeɪv]
concavo-convex▼(having one side concave and the other convex)adjective[UK: kənkˈɑːvəʊkɒnvˈeks] [US: kənkˈɑːvoʊkɑːnvˈeks]
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