Толковый словарь английского языка Oxford English Reference - oxygen

n. Chem. a colourless tasteless odourless gaseous element, occurring naturally in air, water, and most minerals and organic substances, and essential to plant and animal life. Usage Symb.: O. Phrases and idioms oxygen mask a mask placed over the nose and mouth to supply oxygen for breathing. oxygen tent a tentlike enclosure supplying a patient with air rich in oxygen. Derivatives oxygenous adj. Etymology: F oxyg{egrave}ne acidifying principle (as OXY- 2): it was at first held to be the essential principle in the formation of acids