mainsail Meaning, Definition & Usage

  1. noun the lowermost sail on the mainmast

WordNet


Main"sail` noun
Definitions
  1. (Naut.) The principal sail in a ship or other vessel.
    [They] hoised up the mainsail to the wind. Acts xxvii. 40.
    ✍ The mainsail of a ship is extended upon a yard attached to the mainmast, and that of a sloop or schooner upon the boom.

Webster 1913