operating room

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room

 [ro̳m]
a place in a building enclosed and set apart for occupancy or for the performance of certain procedures.
birthing room a hospital room that is utilized for labor and delivery. It is decorated in a homelike, comfortable fashion and contains a specially equipped bed that can be adjusted for delivery. Specialized equipment is often concealed.
emergency room popular term for emergency department.
labor, delivery, recovery room a birthing room or suite so equipped that a patient can remain in the same room throughout the birthing experience.
labor, delivery, recovery, postpartum room a birthing room or suite so equipped that a patient can remain in the same room throughout the birthing experience and into the postpartum period.
operating room one especially equipped for the performance of surgical operations.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

operating room

n. Abbr. OR
A room equipped for performing surgical operations.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

op·er·a·ting room

(OR) (opĕr-āt-ing rūm)
An area in a health care facility used to perform nonemergency surgical interventions.
Medical Dictionary for the Dental Professions © Farlex 2012