/ Dictionary / Index T trispast: Meaning and Definition of Find definitions for: tri•spast Pronunciation: (trī'spast), [key] — n. an ancient hoist or hauling device having three blocks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trisomy 21 trispermous Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language