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[ben-zi-deen, -din] /ˈbɛn zɪˌdin, -dɪn/
noun, Chemistry.
a grayish, crystalline, slightly water-soluble, basic compound, C 12 H 12 N 2 , usually derived from nitrobenzene: used chiefly in the synthesis of certain azo dyes, especially Congo red.
Origin of benzidine
1875-80; benz- + -id3 + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for benzidine
Historical Examples
  • benzidine (Wallis) has also been suggested for the detection of free chlorine.

    Chlorination of Water Joseph Race
British Dictionary definitions for benzidine


/ˈbɛnzɪˌdiːn; -dɪn/
a grey or reddish poisonous crystalline powder that is used mainly in the manufacture of dyes, esp Congo red. Formula: NH2(C6H4)2NH2
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
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benzidine in Medicine

benzidine ben·zi·dine (běn'zĭ-dēn')
A yellowish, white, or reddish-gray crystalline powder used in dyes and to detect blood.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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benzidine in Science
A yellowish, white, or reddish-gray crystalline powder that is produced synthetically and is carcinogenic. It is used in making dyes, as a reagent, and in detecting blood stains. Chemical formula: C12H12N2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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