Breadcrumb Home > Thesaurus > I Synonyms of isthmus Find synonyms for: Noun 1. isthmus, land, dry land, earth, ground, solid ground, terra firma usage: a relatively narrow strip of land (with water on both sides) connecting two larger land areas 2. isthmus, band, tissue usage: a cord-like tissue connecting two larger parts of an anatomical structure WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of isthmus (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: jerrybuilt Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language