Breadcrumb Home > Dictionary > Index O operating room: Meaning and Definition of Find definitions for: op'erating room" Pronunciation: [key] a specially equipped room, usually in a hospital, where surgical procedures are performed. Abbr.: OR Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. operating income operating system TrendingHere are the facts and trivia that people are buzzing about. Ramadan and Eid al-Fitr 42 Best War Movie Quotes Current Events This Week: March 2023 Recycling Facts William Shakespeare Worst U.S. Forest Fires ✖ Related Content Daily Word Quiz: tangential Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language