from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of a class of dyes, varying from blue to black, used in the manufacture of inks and for dyeing wood and textiles.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A dark blue synthetic dyestuff of the induline group.
from the GNU version of the Collaborative International Dictionary of English
- n. A dark blue dyestuff, of the induline group; -- called also azodiphenyl blue.
from The Century Dictionary and Cyclopedia
- n. A coal-tar color used in dyeing, prepared from the hydrochlorid of violaniline.
- n. The name is applied to three different coal-tar colors:
- n. Spirit-soluble nigrosine, which is closely allied to spirit-soluble induliue.
- n. Water-soluble nigrosine, which is the sodium salt of certain snlphonic acids of spirit-soluble nigrosine.
- n. Methylene gray (which see, under gray).
Latin niger, nigr-, black; + -os(e)2 + -ine2.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin niger, "black". (Wiktionary)