/ Dictionary / Index S square piano: Meaning and Definition of Find definitions for: square' pian'o Pronunciation: [key] a piano with a rectangular, horizontal body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. square one square-rigged Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language