• Webster's Revised Unabridged Dictionary
    • n Organogen (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.
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Century Dictionary and Cyclopedia
    • n organogen A chemical element, usually carbon, and, in a less degree, hydrogen, oxygen, nitrogen, sulphur, and phosphorus, which is regarded as the characteristic constituent of an organic compound.
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Webster's Revised Unabridged Dictionary
Organo-, + -gen,