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From The Collaborative International Dictionary of English v.0.48:
Naumachy \Nau"ma*chy\ (n[add]"m[.a]*k[y^]), n. [L. naumachia, Gr. naymachi`a; nay^s ship + ma`chh fight, battle, ma`chesqai to fight.] 1. A naval battle; esp., a mock sea fight put on by the ancient Romans. [1913 Webster] 2. (Rom. Antiq.) A show or spectacle representing a sea fight; also, a place for such exhibitions. [1913 Webster]