"An operating theater (also known as an operating room (OR), operating suite, or operation suite) is a facility within a hospital where surgical operations are carried ...
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out in an aseptic environment.
Historically, the term "operating theatre" referred to a non-sterile, tiered theater or amphitheater in which students and other spectators could watch surgeons perform surgery. Contemporary operating rooms are devoid of a theatre setting, making the term "operating theater" a misnomer. There are only two old-style operating theaters left, both of which are preserved as part of museums.[citation needed]" - (en.wikipedia.org 01.03.2020)
