Meaning of quinone diimine

quinone' di'i•mine

Pronunciation: (dī'u-mēn"), [key]
— Chem. Chem.
  1. a colorless, crystalline solid, CHN, the parent of the indamine dyes. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.