- Io⇄Io orio moth,
a large yellowish moth of North American forests with a bluish eyespot on each hind wing. Its caterpillar is a green silkworm with a red and white stripe down each side and poisonous bristles. - Io⇄Io(no period),
ionium (isotope). - Io⇄Io, noun.
1. (Greek Mythology.) a maiden loved by Zeus. Zeus changed Io into a white heifer to conceal her from the jealous Hera, who in turn set Argus to watch her, and later sent a great gadfly to torment her continually.
2. the third large