1. (

• pellagra ,
• Alpine_scurvy ,
• mal_de_la_rosa ,
• mal_rosso ,
• maidism ,
• mayidism ,
• Saint_Ignatius'_itch

) 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 ;