pearlite: a lamellar mixture of cementite and ferrite formed during the cooling of austenite; a constituent of steel and cast iron
lamellar mixture: a mixture in which substances occur in distinct layers
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