/ Dictionary / Index U unispiral: Meaning and Definition of Find definitions for: u•ni•spi•ral Pronunciation: (y"nu-spī'rul), [key] — adj. having one spiral. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unisonous unit Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language