Толковый словарь английского языка - oxygen

noun Usage: often attributive see: edge Date: 1788 a reactive element that is found in water, in most rocks and minerals, in numerous organic compounds, and as a colorless tasteless odorless diatomic gas constituting 21 percent of the atmosphere, that is capable of combining with all elements except the inert gases, that is active in physiological processes, and that is involved especially in combustion, something that sustains or fuels , ~less adjective