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A carcinogenic yellowish, white, or reddish-gray crystalline powder, C12H12 N2, that is a derivative of biphenyl, is used in dyes, and is used to detect blood stains and cyanide.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈbɛnzɪˌdiːn; -dɪn)
(Elements & Compounds) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈbɛn zɪˌdin, -dɪn)

a crystalline base, C12H12N2, used in the synthesis of azo dyes, esp. Congo red.
[1875–80; benz- + -idine]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
After these procedures, color reaction with tetramethyl benzidine was quantified in a plate reader at 450 nm (Quick Elisa, Thermo Fisher Scientific, USA).
Mutagenicity of benzidine and benzidine-congener dyes and selected monoazo dyes in a modified Salmonella assay.
Bone marrow haematopoietic cell fate identification applying Graham-Knoll Benzidine staining also needs to be done to see the effect in all blood cells morphologies and stages.
After, buffer washing, 100 ul of Tetra Methyl Benzidine (TMB) substrate was added and incubated for 15 minutes at room temperature.
Slides were incubated in Diamino benzidine (DAB) or other suitable peroxidase substrate.
Exposure to certain industrial chemicals, such as aniline dyes, benzidine and xenylamine, is also thought to be linked to a higher rates of bladder cancer.
Peroxidase activity was revealed by adding 100 [micro]l per well of tetra methyl benzidine (Sigma-Aldrich) in dark.
The slides were developed using a diamino- benzidine (DAB)-peroxidase substrate for 20-30 min at room temperature.
Controlling the FDR at 0.1, notable positive associations were for 1,4-dioxane, bromoform, dibenzofurans, glycol ethers, methyl ferf-butyl ether (MTBE), and propionaldehyde; whereas 1,4- dichlorobenzene, 4,4'-methylene diphenyl diisocyanate (MDI), benzidine, and ethyl carbamate (urethane) were inversely associated with an ASD diagnosis.