| io moth | (n) large yellow American moth having a large eyelike spot on each hind wing; the larvae have stinging spines, Syn. Automeris io |
| Io moth | (Zool.) 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. [ 1913 Webster ] |