/ Dictionary / Index D duodenal: Meaning and Definition of Find definitions for: du•o•de•nal Pronunciation: (d"u-dēn'l, dy"-&wdspcd-od'n-ul, dy-), [key] — adj. of or pertaining to the duodenum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: duodenal (Thesaurus) duodecimo duodenal ulcer Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language