Breadcrumb Home > Thesaurus > O Synonyms of obs Find synonyms for: Noun 1. Ob, Ob River usage: a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea 2. obstetrics, OB, tocology, midwifery, medicine, medical specialty usage: the branch of medicine dealing with childbirth and care of the mother WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of obs (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: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language