a maiden loved by Zeus and turned into a white heifer by either Zeus or Hera
Io in British English2
(ˈaɪəʊ)
noun
the innermost of the four Galilean satellites of Jupiter, displaying intense volcanic activity. Diameter: 3640 km; orbital radius: 422 000 km
Io in British English3
the chemical symbol for
ionium
Io in American English1
(ˈaɪˌoʊ; for 2, also ˈiˌoʊ)
noun
1. Greek Mythology
a maiden loved by Zeus and changed into a heifer by jealous Hera or, in some tales, by Zeus to protect her: she is watched by Argus and is driven to Egypt, where she regains human form
2.
the third largest satellite of Jupiter: discovered in 1610 by Galileo and found in 1979 to be volcanically active