from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A type of moth, the io moth.
  • interj. An exclamation of joy or triumph.

from The Century Dictionary and Cyclopedia

  • A Latin interjection, or exclamation of joy or triumph: sometimes used as a noun in English.
  • n. In mythology, a daughter of Inachus, metamorphosed into a heifer and caused to be tormented by a terrible gadfly by Hera, in jealous revenge for the favors of Zeus. See Argus, 1.
  • n. The innermost of the four satellites of Jupiter.
  • n. In entomology: A genus of vanessoid butterflies.
  • n. [lowercase] The peacock butterfly, Vanessa io: used both as the technical specific name and as an English word.
  • n. [lowercase] A showy and beautiful moth of North America, Hyperchiria io, or Saturnia io, of yellow coloration, with prominent pink and bluish eyes on the hinder wings.
  • n. An abbreviation of Iowa.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the closest of Jupiter's moons; has active volcanoes
  • n. (Greek mythology) a maiden seduced by Zeus; when Hera was about to discover them together Zeus turned her into a white heifer


from Wiktionary, Creative Commons Attribution/Share-Alike License

Modern Latin, from Ancient Greek ἰώ (iṓ, "Io").

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin; compare Ancient Greek ἰώ (iō, "oh!").



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  • The io moth of North America (OED2); a cry of joy (SOWPODS); Hawaiian Hawk (not obsolete) (MW3).

    December 8, 2007

  • Obsolete name for the Hawaiian Hawk.

    December 7, 2007