D defs.my
Entry 1 sense Webster, 1913

Mainsail

/(mān"sāl`)/ · Main·sail · IPA /ˈmeɪnseɪl/
01 n. The principal sail in a ship or other vessel.
  1. 1.
    The principal sail in a ship or other vessel.(Naut.)
    “[They] hoised up the mainsail to the wind.” — Acts xxvii. 40.