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Search results for 'oxygen':

oxygen noun (symbol O, atomic number 8) a colourless odourless tasteless gas, the atmospheric form of which is produced by photosynthesis, and which is an essential requirement of most forms of plant and animal life. It is the most abundant element in the Earth's crust (50%), and constitutes about 21% (by volume) of the Earth's atmosphere. oxygenous adj 1 containing or consisting of oxygen. 2 originally producing acids; acidifying.
ETYMOLOGY: 18c: from French oxygène, ultimately from Greek oxys sharp or acid + gennaein to generate, from the old belief that all acids contained oxygen.