topsail
Pronunciation:
/ˈtɒp.seɪl//ˈtɑp.seɪl/noun
Definitions
A sail or either of the two sails rigged just above the course sail and supported by the topmast on a square-rigged sailing ship.
In a fore-and-aft-rigged sailing boat, the sail that is set above the gaff at the top part of the mast.