1. Plural of pellagra; instances or cases of a disease caused by niacin (vitamin B3) deficiency, characterized by dermatitis, diarrhea, dementia, and other symptoms.
Usage: Medical term; Pellagra is the singular form; pellagras is the plural

Examples

• In the early 20th century, pellagras affected thousands of people in the southern United States.
• The doctor studied several cases of pellagras in the impoverished communities.
• Pellagras became less common after niacin was added to enriched grain products.
• Nutritionists worked to prevent pellagras by promoting diets rich in B vitamins.
• Historical records document the prevalence of pellagras during times of poor nutrition.