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Noun: Io  I-ow
  1. The closest of Jupiter's moons; has active volcanoes
     
  2. (Greek mythology) a maiden seduced by Zeus; when Hera was about to discover them together Zeus turned her into a white heifer

Derived forms: Ios

Type of: Galilean, Galilean satellite, maid, maiden [archaic]

Encyclopedia: Io, Semiramide