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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.