Usage Note
Tossicità is an invariable noun ending in an accented vowel — la tossicità does not change form in the plural (le tossicità). It is a technical/scientific term used in pharmacology and toxicology; in everyday speech Italians are more likely to say è tossico ('it's toxic') rather than using the abstract noun.
Examples
"La tossicità del farmaco è alta."
Natural Translation
The toxicity of the drug is high.

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