/ Dictionary / Index A acid dye: Meaning and Definition of Find definitions for: ac'id dye' Pronunciation: [key] — Chem. Chem. 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. acid dust acid-fast Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language