Breadcrumb Home > Thesaurus > I Synonyms of ischium Find synonyms for: Noun 1. ischium, ischial bone, os ischii, bone, os usage: one of the three sections of the hipbone; situated below the ilium WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ischium (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