TOLUIDINE
Noun
toluidine (plural toluidines)
(organic compound) Any of the three isomeric aromatic amines derived from toluene; they are used in the synthesis of certain dyes
Source: Wiktionary
To*lu"i*dine, n. (Chem.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition