[ tol-i-deen, -din ]
/ ˈtɒl ɪˌdin, -dɪn /
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noun Chemistry.

any of several isomeric derivatives of biphenyl containing two methyl and two amino groups, especially the ortho isomer that is used as a reagent and in the preparation of dyes.



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Origin of tolidine

First recorded in 1895–1900; tol(uene) + -id3 + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for tolidine

  • Thus diazotised benzidine and tolidine combine with salicylic acid to form valuable yellow azo-dyes known as “chrysamines.”

    Coal|Raphael Meldola
  • Ellms and Hauser investigated benzidine in 1913 and found it to be inferior to o-tolidine as a test reagent for free chlorine.

  • It is impossible to attempt to specify by name any of these recent benzidine and tolidine dyes.

    Coal|Raphael Meldola

British Dictionary definitions for tolidine

/ (ˈtɒlɪˌdiːn) /


any of several isomeric compounds, esp the ortho- isomer, which is a white or reddish crystalline substance used in the manufacture of dyes and resins. Formula: (C 6 H 3 NH 2 CH 3) 2

Word Origin for tolidine

C19: from tol (uene) + -id ³ + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012