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The Collaborative International Dictionary

Indogen

Indogen \In"do*gen\, n. [Indigo + -gen.] (Chem.) A complex, nitrogenous radical, C8H5NO, regarded as the essential nucleus of indigo.

Wiktionary

indogen

n. (context organic compound English) A complex nitrogenous radical, C₈H₅NO, regarded as the essential nucleus of indigo.