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From The Collaborative International Dictionary of English v.0.48:
Zygenid \Zyg"e*nid\, n. [Cf. Gr. ?, probably the hammer-headed shark.] (Zool.) Any one of numerous species of moths of the family Zygaenidae, most of which are bright colored. The wood nymph and the vine forester are examples. Also used adjectively. [1913 Webster]