Cytotoxicity

/ˌsaɪtoʊtɑkˈsɪsɪti/ noun

Definition

The degree or quality of being poisonous or harmful to cells.

Etymology

From cytotoxic + -ity (Latin -itas, suffix forming abstract nouns). Developed as researchers needed to quantify how damaging various substances were to living cells.

Kelly Says

Scientists measure cytotoxicity by counting how many cells survive after exposure to a drug—it's like a report card showing how well a medicine kills cancer without being too brutal to healthy tissue. The most promising cancer drugs show high cytotoxicity toward tumors but low cytotoxicity toward normal cells.

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