[nahy-gruh-seen, -sin]
noun Chemistry.
any of the class of deep blue or black dyes obtained by the oxidation of aniline, used as coloring agents in inks and shoe polishes and for dyeing leather, wood, textiles, and furs.
Also, nigrosin [nahy-gruh-sin] .

1890–95; < Latin nigr- (stem of niger) black, dark + -ose + -ine1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nigrosine or nigrosin (ˈnɪɡrəˌsiːn, -sɪn, ˈnɪɡrəsɪn)
any of a class of black pigments and dyes obtained from aniline: used in inks and shoe polishes and for dyeing textiles
[C19: from Latin niger black + -ose1 + -ine1]
nigrosin or nigrosin
[C19: from Latin niger black + -ose1 + -ine1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

nigrosine (nī'grə-sēn', -sĭn) or ni·gro·sin (-sĭn)
Any of a class of aniline dyes that vary from blue to black and are used as stains for nervous tissue and as a negative stain for bacteria and spirochetes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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