/ Dictionary / Index M main-topsail: Meaning and Definition of Find definitions for: main-top•sail Pronunciation: (mān"top'sāl"Naut.mān"top's&schwal), [key] — n. Naut. a topsail set on the mainmast. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: main-topsail (Thesaurus) main-topmast main-topsail schooner Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language