Breadcrumb Home > Thesaurus Cite Synonyms of xx Find synonyms for: Noun1. twenty, 20, XX, large integerusage: the cardinal number that is the sum of nineteen and one2. XX, sex chromosomeusage: (genetics) normal complement of sex chromosomes in a femaleAdjective1. twenty, 20, xx, cardinal (vs. ordinal)usage: denoting a quantity consisting of 20 items or unitsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.See also: xx (Dictionary) Related Content Daily Word Quiz: occultation Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language Synonyms Index