nOrcein(Chem) A reddish brown amorphous dyestuff, C7H7NO3, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.
Century Dictionary and Cyclopedia
norceinA nitrogenous compound (C7H7NO3) formed from orcine and ammonia. It is a deep-red powder of strong tinctorial power, and when dissolved in ammonia is the basis of the archil of commerce. See orcine.