Killer-cell meaning

Any of various lymphocytes that recognize and lyse target cells bearing a specific foreign antigen, usually by infection with a virus, and that also function in defense against cancer cells.
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Any of various cells that destroy germs, infected cells, etc.; esp., a lymphocyte (killer T cell) that destroys infected or cancerous cells by releasing proteins that damage the cell membranes of the target cells.
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Any of various lymphocytes, such as cytotoxic T lymphocytes and natural killer cells, that kill infected or malignant cells.
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