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.