Breadcrumb Home > Thesaurus > I Synonyms of ionosphere Find synonyms for: Noun 1. ionosphere, region, part usage: the outer region of the Earth's atmosphere; contains a high concentration of free electrons WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ionosphere (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: jactation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language