/ Dictionary / Index D dilator: Meaning and Definition of Find definitions for: di•la•tor Pronunciation: (dī-lā'tur, di-, dī'lā-), [key] — n. a muscle that dilates some cavity of the body. an instrument for dilating body canals, orifices, or cavities. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dilator (Thesaurus) dilatometer dilatory Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language