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[tuh-loo-i-deen, -din] /təˈlu ɪˌdin, -dɪn/
noun, Chemistry
any of three isomeric amines having the formula C 7 H 9 N, derived from toluene: used in the dye and drug industries.
Origin of toluidine
1840-50; tolu(ene) + -id3 + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for toluidine


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: C6H4CH3NH2
Word Origin
C19: from tolu(ene) + -ide + -ine²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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toluidine in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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