Organogen

Or`gan´o`gen

n.

1.

(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.

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.