/ Dictionary / Index B bronchodilator: Meaning and Definition of Find definitions for: bron•cho•di•la•tor Pronunciation: (brong"kō-dī-lā'tur, -di-), [key] — n. a substance that acts to dilate constricted bronchial tubes to aid breathing, used esp. for relief of asthma. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bronchodilator (Thesaurus) bronchocele bronchography Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language