arisarum: tuberous or rhizomatous perennial herbs; mainly Mediterranean area
abstraction: a general concept formed by extracting common features from specific examples
pellagra: 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