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]
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