/ Dictionary / Index T three-square: Meaning and Definition of Find definitions for: three-square Pronunciation: (thrē'skwâr'), [key] — adj. having an equilateral triangular cross section, as certain files. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. three-spot three-star Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language