/ Dictionary / Index K killer-diller: Meaning and Definition of Find definitions for: kill•er-dill•er Pronunciation: (kil'ur-dil'ur), [key] — n. Older Slang. killer (def. 5). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. killer cell killer T cell Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language