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Io

in Greek mythology, daughter of the river god Inachus, she was pursued by Zeus, who changed her to a heifer in a bid to escape the notice of Juno, but she was tormented by a gadfly sent by Juno. The Jovian moon was discovered in 1610 and named for her by Galileo.

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Definitions of Io from WordNet

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