toluidine

To*lu"i*dine, n. (Chem.) Defn: Any one of three metameric amido derivatives of toluene analogous to aniline, and called respectively orthtoluidine, metatoluidine, and paratoluidine; especially, the commonest one, or paratoluidine, which is obtained as a white crystalline substance. Note: It is used in the aniline dye industry, and constitutes the essential nucleus or radical of those dyes.

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