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The Collaborative International Dictionary
Erythrosin

Erythrosin \E*ryth"ro*sin\, n. [Gr. 'eryqro`s red.] (Chem.)

  1. A red substance formed by the oxidation of tyrosin.

  2. A red dyestuff obtained from fluoresce["i]n by the action of iodine. [1913 Webster] ||

Wiktionary
erythrosin

n. 1 (context chemistry English) A red substance formed by the oxidation of tyrosin. 2 (context chemistry English) A red dyestuff obtained from fluorescein by the action of iodine.