mainsail
oxford
views updated Jun 27 2018main·sail / ˈmānsəl; -ˌsāl/ •
n. the principal sail of a ship, esp. the lowest sail on the mainmast in a square-rigged vessel. ∎ the sail set on the after side of the mainmast in a fore-and-aft-rigged vessel.
The Oxford Pocket Dictionary of Current English