Source : Webster's Revised Unabridged Dictionary (1913)

Io moth \I"o moth`\ (?; 115). (Zo["o]l.)
   A large and handsome American moth ({Hyperchiria Io}), having
   a large, bright-colored spot on each hind wing, resembling
   the spots on the tail of a peacock. The larva is covered with
   prickly hairs, which sting like nettles.

Source : WordNet®

io moth
     n : large yellow American moth having a large eyelike spot on
         each hind wing; the larvae have stinging spines [syn: {Automeris
         io}]