Definition of "pyrrolizidine" []

• Any of a class of alkaloids, found in many plants, that are hepatotoxic (noun)

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• "And some preparations might also contain certain chemicals, called pyrrolizidine alkaloids (PAs), that can harm the liver and lungs."
• "And some preparations might also contain certain chemicals, called pyrrolizidine alkaloids PAs, that can harm the liver and lungs."
• "One important subgroup in this category is that known as the pyrrolizidine alkaloids."