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The Collaborative International Dictionary of English v.0.48:

Erythrosin \E*ryth"ro*sin\, n. [Gr. 'eryqro`s red.] (Chem.) (a) A red substance formed by the oxidation of tyrosin. (b) A red dyestuff obtained from fluoresce["i]n by the action of iodine. [1913 Webster]