[ tuh-loo-i-deen, -din ]

  1. any of three isomeric amines having the formula C7H9N, derived from toluene: used in the dye and drug industries.

Origin of toluidine

First recorded in 1840–50; tolu(ene) + -id3 + -ine2

Words Nearby toluidine Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use toluidine in a sentence

  • The result is a diazo-salt; aniline, for example, giving diazobenzene chloride, and toluidine diazotoluene chloride.

    Coal | Raphael Meldola
  • The large quantity of aniline and toluidine now made has opened up a channel for the use of the waste borings from cast-iron.

    Coal | Raphael Meldola
  • It was because he was working with impure chemicals, with aniline containing a little toluidine, that he discovered mauve.

    Creative Chemistry | Edwin E. Slosson
  • The aniline selected for this purpose should contain about 25% of the toluidine.

  • From this it will be evident that an aniline rich in toluidine is an essential condition for obtaining aniline red.

British Dictionary definitions for toluidine


/ (tɒˈljuːɪˌdiːn) /

  1. an amine derived from toluene existing in three isomeric forms; aminotoluene. The ortho- and meta- isomers are liquids and the para- isomer is a crystalline solid. All three are used in making dyes. Formula: C 6 H 4 CH 3 NH 2

Origin of toluidine

C19: from tolu (ene) + -ide + -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

Scientific definitions for toluidine


[ tə-lōōĭ-dēn′ ]

  1. Any of three isomeric compounds containing a benzene ring with a methyl (CH3) and amino (NH2) group attached to it. Toluidine is used to make dyes. Chemical formula: C7H9N.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.