Source : Webster's Revised Unabridged Dictionary (1913)

Zygenid \Zyg"e*nid\, n. [Cf. Gr. ?, probably the hammer-headed
   shark.] (Zo["o]l.)
   Any one of numerous species of moths of the family
   {Zyg[ae]nid[ae]}, most of which are bright colored. The wood
   nymph and the vine forester are examples. Also used
   adjectively.