operating theatre operating theater • operation · · · Info · Definitions · Synonyms · Characters · · operating theatre · · Text Common · · Latin · · Scripts 17 · · Length 5 · · Syllables Definitions · · · (noun) a room in a hospital equipped for the performance of surgical operations. Synonyms: operating room, OR, operating theater, operating theatre, surgery. Example: "Great care is taken to keep the operating rooms aseptic." · · Noun Definition 1 Synonyms · · · operating room · · Synonym 1 or · · Synonym 2 operating theater · · Synonym 3 surgery · · Synonym 4 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074