/ Dictionary / Index T topsail: Meaning and Definition of Find definitions for: top•sail Pronunciation: (top'sāl"Naut.top's&schwal), [key] — n. Naut. a sail, or either of a pair of sails, set immediately above the lowermost sail of a mast and supported by a topmast. See diag. under ship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: topsail (Thesaurus) tops topsail schooner Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language