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From The Collaborative International Dictionary of English v.0.48:
Anomia \A*no"mi*a\, n. [NL., fr. Gr. ? irregular; 'a priv. + no'mos law.] (Zool.) A genus of bivalve shells, allied to the oyster, so called from their unequal valves, of which the lower is perforated for attachment. [1913 Webster]