/ Dictionary / Index P pellagra: Meaning and Definition of Find definitions for: pel•la•gra Pronunciation: (pu-lag'ru, -lā'gru, -lä'-), [key] — n. Pathol. a disease caused by a deficiency of niacin in the diet, characterized by skin changes, severe nerve dysfunction, mental symptoms, and diarrhea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pellagra (Thesaurus) Pella pellagra-preventive factor Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language