mainmast
- n the chief mast of a sailing vessel with two or more masts
- He warned that "he'll be goddamned if he'll stand for one such word from any Christless bastard on board, afore or abaft the mainmast.
- After President Arias of Panama left the Houston at Balboa his Panama's red- white--blue flag dropped from the mainmast and up again went President Roosevelt's four-starred .
- Sir Arthur Henry Rostron, rescuer-hero of the Titanic disaster, flew his newly-acquired Commodore's burgee from the mainmast as the Cunard flagship Berengaria entered New York .