Io /ˈaɪ(ˌ)o/
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I·o n.; pl. Ios An exclamation of joy or triumph; -- often interjectional.
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Io
n 1: (Greek mythology) a maiden seduced by Zeus; when Hera was
about to discover them together Zeus turned her into a
white heifer
2: the closest of Jupiter's moons; has active volcanoes