[ ben-zi-deen, -din ]
/ ˈbɛn zɪˌdin, -dɪn /
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noun Chemistry.
a grayish, crystalline, slightly water-soluble, basic compound, C12H12N2, usually derived from nitrobenzene: used chiefly in the synthesis of certain azo dyes, especially Congo red.
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Origin of benzidine

First recorded in 1875–80; benz- + -id3 + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use benzidine in a sentence

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

    Coal|Raphael Meldola
  • Benzidine (Wallis) has also been suggested for the detection of free chlorine.

  • 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 benzidine

/ (ˈbɛnzɪˌdiːn, -dɪn) /

a grey or reddish poisonous crystalline powder that is used mainly in the manufacture of dyes, esp Congo red. Formula: NH 2 (C 6 H 4) 2 NH 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

Medical definitions for benzidine

[ bĕnzĭ-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.

Scientific definitions for benzidine

[ bĕnzĭ-dēn′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.