1) Diving medicine 
Hyperoxia is excess oxygen or higher than normal partial pressure of oxygen. In medicine, it refers to excess oxygen in the lungs or other body tissues, which can be caused by breathing air or oxygen at pressures greater than normal atmospheric pressure. This kind of hyperoxia can lead to oxygen toxicity. In the environment, it refers to excess ox...
An increased concentration of oxygen in the tissues and organs.
An excess of oxygen in the system, resulting from exposure to high oxygen concentrations, especially to hyperbaric pressures of oxygen. ... (12 Dec 1998) ... 
(hi″pәr-ok´se-ә) excessive oxygen in the body.
Type: Term Pronunciation: hī′pĕr-ok′sē-ă Definitions: 1. An increased amount of oxygen in tissues and organs. 2. A greater oxygen tension than normal, such as that produced by breathing air or oxygen at pressures greater than 1 atmosphere.
hyperoxia A condition characterized by abnormally high levels of oxygen in the blood and tissues.
A condition in which the total oxygen content of the body is increased above that normally existing at sea level. See also: Hypobarism.