n. a nutritional disease due to a deficiency of nicotinic acid (a B vitamin). Pellagra results from the consumption of a diet that is poor in either nicotinic acid or the amino acid tryptophan, from which nicotinic acid can be synthesized in the body. It is common in maize-eating communities. The symptoms of pellagra are scaly dermatitis on exposed surfaces, diarrhoea, and depression.
Subjects: Medicine and Health.