Fore-topgallant :: Fore-topgallant (a.) Designating the mast, sail, yard, etc., above the topmast; as, the fore-topgallant sail. See Sail..
Topgallant :: Topgallant (a.) Situated above the topmast and below the royal mast; designatb, or pertaining to, the third spars in order from the deck; as, the topgallant mast, yards, braces, and the like. See Illustration of Ship..