/ Thesaurus / I Synonyms of irrational number Find synonyms for: Noun1. irrational number, irrational, real number, realusage: a real number that cannot be expressed as a rational numberWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language