Wiktionary
cytotoxicity
n. the state of being toxic to cells
WordNet
cytotoxicity
n. the degree to which something is toxic to living cells
Wikipedia
Cytotoxicity
Cytotoxicity is the quality of being toxic to cells. Examples of toxic agents are an immune cell or some types of venom, e.g. from the puff adder (Bitis arietans) or brown recluse spider (Loxosceles reclusa).