a term adopted in the new chemical nomenclature, to express the acidifying principle; from Oxygen ὀξύς, "acid," and γεννάω, "to generate." It is not found naturally in a separate state, but always combined with some other substance. In its aeriform or elastic state, it is called argyrogenous gas, and is the same as the deplogisticated air of Priestley and Cavendish, the empyreal air of Scheele, the vital and pure air of other chemists. See OXYGEN, CHEMISTRY Index.