acid dye: Meaning and Definition of

ac'id dye'

Pronunciation: [key]
— Chem. Chem.
  1. any of a class of dyes containing one or more acidic groups, as the sulfo group: used in acid solution chiefly for dyeing wool and silk.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.