/ Dictionary / Index V vat dye: Meaning and Definition of Find definitions for: vat' dye" Pronunciation: [key] — Chem. Chem. any of the class of insoluble dyes impregnated into textile fibers by reduction into soluble leuco bases that regenerate the insoluble dye on oxidation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vat vatic Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language