noun, often capitalized
Ni·​gro·​sine | \ ˈnīgrəˌsēn, -sə̇n \
variants: or nigrosine or less commonly Nigrosin \ -​sə̇n \ or nigrosin
plural -s

Definition of Nigrosine

: any of several azine dyes closely related to the indulines: such as
a or Nigrosine Base B : an oil-soluble bluish black dye obtained as the free base by heating aniline and aniline hydrochloride and nitrobenzene or nitrophenol in the presence of iron and used chiefly in coloring waxes, shoe polish, plastics, and lacquers and as wood stains
b or Nigrosine Spirit Soluble : a chloride of the free base that is soluble in alcohol and is used similarly
c or Nigrosine Water Soluble : a water-soluble sulfonation product of the free base or of its chloride used chiefly in dyeing leather and paper and as a biological stain

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for Nigrosine

Latin nigr-, niger black + English -ose + -ine or -in

Keep scrolling for more

Learn More about Nigrosine

Statistics for Nigrosine

Cite this Entry

“Nigrosine.” Dictionary, Merriam-Webster, Accessed 7 Aug. 2020.

Comments on Nigrosine

What made you want to look up Nigrosine? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!