• (n.) The mast erected at the head of the foremast, and at the head of which stands the fore-topgallant mast. See Ship.
Fore`-top'mast noun (Nautical) The mast erected at the head of the foremast, and at the head of which stands the fore-topgallant mast. See Ship . 
[n] - the topmast next above the foremast
noun the topmast next above the foremast
the spar or section of a pole mast serving as the topmast of a foremast on a ship.