Definition of fore-topgallant mast in English:

fore-topgallant mast

noun

  • The third section of a sailing ship's foremast, above the foretopmast.

    • ‘The Tops, Trestletrees, Crosstrees, Caps, &c. for the Fore-mast, fore-topmast, fore-topgallant-mast, &c. are the same size as the main-caps, trestletrees, crosstrees, &c.’