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Any of a class of dyes, varying from blue to black, used in the manufacture of inks and for dyeing wood and textiles.
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.
nigrosine(ˈnɪɡrəˌsiːn; -sɪn) or
(Dyeing) 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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ni•gro•sine(ˈnaɪ grəˌsin, -sɪn)
any of the class of deep blue or black dyes obtained by the oxidation of aniline.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.