- a topsail set on the mainmast
Collins Concise English Dictionary © HarperCollins Publishers::
maintopsail /ˌmeɪnˈtɒpseɪl; ˌmeɪnˈtɒpsəl/ n
main-top•sail
(mān′top′sāl′; Naut. mān′top′səl),USA pronunciation n. [Naut.]
- Nauticala topsail set on the mainmast. See diag. under ship.
- 1610–20