/ Dictionary / Index K killer T cell: Meaning and Definition of Find definitions for: killer T cell Pronunciation: [key] a killer cell that destroys target cells only when specifically activated by helper T cells. Cf. natural killer cell. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. killer-diller killer whale Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language