" killer cell "

[Noun]  | "killer cell" 

1: a lymphocyte (such as a killer T cell or a natural killer cell) with cytotoxic activity

Origin: 1972 ;

[Noun]  | "natural killer cell" 

1: a large granular lymphocyte capable especially of destroying tumor cells or virally infected cells without prior exposure to the target cell and without having it presented with or marked by a histocompatibility antigen —called also NK cell

Origin: 1975 ;

[Noun]  | "killer T cell" 

1: cytotoxic t cell

Origin: 1971 ;