main topmast
/ˈmeɪnˌtɑpmæst/
noun
- The mast that is directly above the mainmast on a sailing ship, used to support sails and rigging.
- The sailor climbed the main-topmast to adjust the sail during the storm.
- From the crow's nest on the main-topmast, the lookout spotted land ahead.
- The ship's main-topmast was damaged in the heavy winds and had to be repaired.