noun -
a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments
Synonyms:
alpine scurvy
mal de la rosa
mal rosso
mayidism
pellagra
saint ignatius' itch