Webster's English Dictionary

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concave

1. con.cave \ka:n-'ka-v, 'ka:n-.\ aj [MF, fr. L concavus, fr. com- + cavus 
   hollow - more at C]AVE : hollowed or rounded inward like the inside of a 
   bowl  - con.cave.ly av
2. con.cave \'ka:n-.ka-v\ n : a concave line or surface