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Noun: topgallant mast  ,tóp'ga-lunt mãst
Usage: archaic
  1. A mast fixed to the head of a topmast on a square-rigged vessel
    "The sailor climbed up to the topgallant mast to adjust the rigging";
    - topgallant

Derived forms: topgallant masts

Type of: topmast

Encyclopedia: Topgallant mast