The degree or severity to which a substance can damage or poison liver cells.
From 'hepatotoxic' + '-ity' (suffix forming nouns of state or quality). The noun form quantifies how much harm a substance can do to the liver.
Pharmaceutical companies spend billions testing hepatotoxicity because the liver is irreplaceable—you only get one, and once it's scarred (cirrhosis), you can't fix it, which is why so many medications have strict dosage limits.
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