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From The Collaborative International Dictionary of English v.0.48:
Organogen \Or*gan"o*gen\, n. [Organo- + -gen.] (Chem.) A name given to any one of the four elements, carbon, hydrogen, oxygen, and nitrogen, which are especially characteristic ingredients of organic compounds; also, by extension, to other elements sometimes found in the same connection; as sulphur, phosphorus, etc. [1913 Webster]