Breadcrumb Home > Thesaurus > O Synonyms of orifice Find synonyms for: Noun 1. orifice, opening, porta, passage, passageway usage: an aperture or hole that opens into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of orifice (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: tintinnabulation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language