A disease caused by a deficiency of niacin and protein in the diet and characterized by skin eruptions, digestive and nervous system disturbances, and eventual mental deterioration.
ETYMOLOGY:
Italian : pelle, skin (from Latin pellis; see pel-3 in Appendix I) + -agra, a seizure (from Latin, from Greek -agr, from agr, a seizing; see ag- in Appendix I).
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