/ Dictionary / Index T twibill: Meaning and Definition of Find definitions for: twi•bill Pronunciation: (twī'bil"), [key] — n. a mattock with one arm like that of an adz and the other like that of an ax. a double-bladed battle-ax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Twi twice Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language