Definitions for "Oxygen toxicity"
oxygen breathed at partial pressures higher than about 1.6 atmospheres (see ambient pressure) -- which occurs at a depth of 218 feet for a diver breathing air -- quickly becomes toxic and can lead to sudden convulsions and unconsciousness
Damage or injury from inhaling too much oxygen. Dangerous if oxygen partial pressure exceeds 1.6 ATA - at around 66 metres using normal air. One of the first symptoms of oxygen toxicity while diving can be seizures.
Physical impairment that results from breathing pure oxygen for prolonged periods of time; the time to achieve toxicity is shortened as the pressure in the surrounding environment increases.