/ Dictionary / Index A antidiuretic: Meaning and Definition of Find definitions for: an•ti•di•u•ret•ic Pronunciation: (an"tē-dī"u-ret'ik), [key] — Biochem., Pharm. Biochem.,Pharm. —adj. of or pertaining to a substance that suppresses the formation of urine. —n. any such substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antidiuretic (Thesaurus) antidisestablishmentarianism antidiuretic hormone Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language