Breadcrumb Home > Thesaurus > I Synonyms of io Find synonyms for: Noun 1. Io usage: (Greek mythology) a maiden seduced by Zeus; when Hera was about to discover them together Zeus turned her into a white heifer 2. Io usage: the closest of Jupiter's moons; has active volcanoes WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of io (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. The Book of Philippians: Summary Current Events This Week: May 2023 Preamble of the United Nations Charter Queen Victoria Books of the Bible: New Testament Books in Order The 88 Recognized Constellations ✖ Related Content Daily Word Quiz: foison Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language