emergency room

a hospital area equipped and staffed for the prompt treatment of acute illness, trauma, or other medical emergencies. Abbreviation: ER
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

emergency room n.
The section of a health care facility intended to provide rapid treatment for victims of sudden illness or trauma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Nowhere is it more difficult than in the emergency room, where split-second
  medical decisions must be made.
But if she has to take her stepson to the emergency room, state law might
  prevent her from authorizing medical treatment.
Miller played the role of the patient, directing his avatar to lie on a
  hospital bed in the virtual emergency room.
If things are too much for you then go to the emergency room immediately.
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