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biconcave▼adjective[UK: baɪˈk.ɒnk.eɪv] [US: baɪˈk.ɑːnk.eɪv]
concavo-concave▼adjective[UK: kənkˈɑːvəʊkɒnkˈeɪv] [US: kənkˈɑːvoʊkɑːnkˈeɪv]
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