To combine with oxygen, or subject to the action of oxygen, or of an oxidizing agent. Specifically: (a) To combine with oxygen or with more oxygen; to add oxygen to; as, to oxidize nitrous acid so as to form nitric acid. (b) To remove hydrogen from (anything), as by the action of oxygen; as, to oxidize alcohol so as to form aldehyde. (c) To subject to the action of oxygen or of an...