Io Definition
īō, ēō
noun
A maiden loved by Zeus and changed into a heifer by jealous Hera or, in some tales, by Zeus to protect her.
Webster's New World
The third largest satellite of Jupiter: discovered in 1610 by Galileo and found in 1979 to be volcanically active.
Webster's New World
A type of moth, the io moth.
Wiktionary
symbol
Ionium.
Webster's New World
interjection
An exclamation of joy or triumph.
Wiktionary