saint ignatius' itch

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• 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