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 (nī′grə-sēn′, -sĭn)
Any of a class of dyes, varying from blue to black, used in the manufacture of inks and for dyeing wood and textiles.

[Latin niger, nigr-, black; see nekw-t- in Indo-European roots + -os(e) + -ine.]
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.


(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


(ˈnaɪ grəˌsin, -sɪn)

any of the class of deep blue or black dyes obtained by the oxidation of aniline.
[1890–95; < Latin nigr-, s. of niger black, dark + -ose2 + -ine1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.