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hyperoxia

(hī′pər-ŏksē-ə)
n.
  1. An excess of oxygen in tissues and organs.
  2. A higher than normal oxygen tension, such as that produced by breathing air or oxygen at greater than atmospheric pressures.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.