ni·trox 
(nītrŏks′)
(nītrŏks′)n.
Air that has a higher percentage of oxygen than atmospheric air, sometimes used in scuba diving to reduce the risk of decompression sickness and to allow for dives that are longer than normal. Also called enriched air.
[NITR(OGEN) + OX(YGEN).]
- underperformer
- underpin
- underpinning
- underplay
- underplot
- underpopulated
- underpopulation
- underprice
- underprivileged
- underproduce
- underproduction
- underproof
- underprop
- underran
- underrate
- underreact
- underreaction
- underreport
- underrepresent
- underrepresentation
- underrepresented
- underrun
- under sail
- underscore
- undersea