/ Thesaurus / O Synonyms of operating theatre Find synonyms for: Noun1. operating room, OR, operating theater, operating theatre, surgery, hospital roomusage: a room in a hospital equipped for the performance of surgical operations; "great care is taken to keep the operating rooms aseptic"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language