mast

noun

1. a tall spar or, now often, a hollow metal structure, sometimes in sections, rising vertically from the keel or deck of a vessel and used to support the sails, yards, radar and radio equipment, etc.
2. a specified section of this: the topmast
3. any vertical pole, as in a crane or derrick
4. a metal post for the support of a radio aerial or television antenna
5. ☆ U.S. Navy a summary session held by the commanding officer to try minor offenses, hear requests, or give commendations
   in full captain's mast

transitive verb

noun