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mainmast noun

  /ˈmeɪn.mæst/ , /ˈmeɪn.mɑːst/
  • (nautical) The tallest mast of a sailing ship that has more than one mast; particularly a full-rigged ship.
  • (nautical) The second-foremost mast of a non-sailing ship with more than one mast.
 grand mât
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