Breadcrumb Home > Thesaurus > S Synonyms of sib Find synonyms for: Noun 1. sibling, sib, relative, relation usage: a person's brother or sister 2. blood relation, blood relative, cognate, sib, relative, relation usage: one related by blood or origin; especially on sharing an ancestor with another WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of sib (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: recidivism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language