a killer cell that destroys target cells only when specifically activated by helper T cells.
killer T cell
A large differentiated T cell that functions in cell-mediated immunity by attacking and lysing target cells that have specific surface antigens. Also called cytotoxic T cell, killer cell.


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  • Killer-whale

    noun 1. any of several predatory dolphins, especially the black-and-white Orcinus orca, found in all seas. noun 1. a predatory black-and-white toothed whale, Orcinus orca, with a large erect dorsal fin, most common in cold seas: family Delphinidae Also called killer, grampus, orc

  • Killfile

    noun a computer file for Usenet or newsgroup access that specifies content to be discarded or ignored; also, a similar file used by an e-mail program; also written kill file Word Origin 1984

  • Kill file

    noun See killfile [Usenet] Per-user file(s) used by some Usenet reading programs (originally Larry Wall’s rn) to discard summarily (without presenting for reading) articles matching some particularly uninteresting (or unwanted) patterns of subject, author, or other header lines. Thus to add a person (or subject) to one’s kill file is to arrange for that person […]

  • Kill for something

    verb phrase To be willing to go to great extremes to get something: I’d kill for a beer now
