Noun: topgallant mast ,tóp'ga-lunt mãst
Usage: archaic
Usage: archaic
- 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