Nigrosine definitions

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.
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Any of a group of blue-black or black dyes used as pigments.
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A dark blue synthetic dyestuff of the induline group.
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Origin of nigrosine

Latin niger nigr- black nekw-t- in Indo-European roots –os(e) –ine