PELLAGRA By N., Pam M.S. - April 7, 2013 noun. an insufficiency of the B vitamin nicotinic acid, characterized by weakness, gastrointestinal disruptions, skin ailments, and neurological indicators. Commonly referred to as nicotinic acid deficiency. PELLAGRA: "The patient is suffering from pellagra." Related Psychology Terms CYSTATHIONINURIA WERNICKE'S ENCEPHALOPATHY ALCOHOLIC NEUROPATHY ASCORBIC ACID THIAMINE (THIAMIN) WOLMAN'S DISEASE VITAMIN A VITAMIN VITAMIN A TOXICITY PHENYLKETONURIA (PKU) Cite this page: N., Pam M.S., "PELLAGRA," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/pellagra/ (accessed September 21, 2019).