Definitions for operating theater
operating room, OR, operating theater, operating theatre, surgery(noun)
a room in a hospital equipped for the performance of surgical operations
"great care is taken to keep the operating rooms aseptic"
An operating theater is a non-sterile, tiered theater or amphitheater in which students and other spectators could watch surgeons perform surgery. Within the Commonwealth nations, the term is used synonymously with operating room or operating suite, the modern facility within a hospital where surgical operations are carried out in a sterile environment.
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"operating theater." Definitions.net. STANDS4 LLC, 2013. Web. 4 Dec. 2013. <http://www.definitions.net/definition/operating theater>.