society > travel > travel by water > vessel, ship, or boat > equipment of vessel > masts, rigging, or sails > spar > [noun] > mast > mainmast (4)
The principal mast in a ship.
With the. A ship's mainmast as the usual place of assembly for a court hearing, public sale, etc., on board ship; frequently in at the mast (also †at…
Nautical. Short for mainsail, n., mainmast, n. (Earlier in main-parrel at main, adj.2 compounds 1.)