Definition of Io moth in US English:

Io moth

noun

  • A large, mainly yellow North American moth of the silkworm moth family, with prominent eyespots on the hind wings.

    Automeris io, family Saturniidae

    • ‘The Io moth (Automeris io) is a very colorful North American moth in the Saturniidae family.’
    • ‘The Io moth, named for a character in Greek mythology, has a very obvious black eyespot on each hindwing.’

Origin

Late 19th century: named after the Greek priestess Io.