/ Dictionary / Index I indoleacetic acid: Meaning and Definition of Find definitions for: in'dole•a•ce'tic ac'id Pronunciation: (in'dōl-u-sē'tik, -set'ik, in"-), [key] — Biochem. Biochem. a crystalline, water-insoluble powder, CHNO, a natural plant hormone, used esp. for stimulating growth and root formation in plant cutting. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. indole indolebutyric acid Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language