\E*ryth"ro*gen\, n. [Gr. 'eryqro`s red + -gen.]
(Chem.)
(a) Carbon disulphide; -- so called from certain red
    compounds which it produces in combination with other
    substances.
(b) A substance reddened by acids, which is supposed to be
    contained in flowers.
(c) A crystalline substance obtained from diseased bile,
    which becomes blood-red when acted on by nitric acid or
    ammonia.