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concave▼◼◼◼(curved inward)adjective[UK: ˈkɒŋk.eɪv] [US: kanˈkeɪv]
biconcave▼◼◼◼(lens)adjective[UK: baɪˈk.ɒnk.eɪv] [US: baɪˈk.ɑːnk.eɪv]
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