/ Dictionary / Index I isatin: Meaning and Definition of Find definitions for: i•sa•tin Pronunciation: (ī'su-tin), [key] — n. Chem. a yellowish-red or orange, crystalline, water-soluble solid, CHNO, used chiefly in the synthesis of vat dyes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isarithm -isation Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language