noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any of a series of blue, bluish-red and black dyestuffs, formed by the interaction of para-amino azo compounds with primary monoamines in the presence of a small quantity of a mineral acid.

Etymology

Perhaps from indigo; see -ine.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.