/ Dictionary / Index D drill bit: Meaning and Definition of Find definitions for: drill' bit" Pronunciation: [key] bit (defs. 1a, b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. drill drill chuck Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language