/ Dictionary / Index D dietitian: Meaning and Definition of Find definitions for: di•e•ti•tian Pronunciation: (dī"i-tish'un), [key] — n. a person who is an expert in nutrition or dietetics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dietitian (Thesaurus) diethyltryptamine diet kitchen Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language