noun a topgallant mast or sail.
2. topgallant ·adj fig.: highest; elevated; splendid.
3. topgallant ·noun fig.: anything elevated or splendid.
4. topgallant ·adj 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.