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.
1) The mast section next above the topmast and the highest mast section on the Lady. 2) The yard supported by that mast. 3) The third lowest square sail (and the highest sail on the Lady Washington). It is stretched between the topgallant yard and the top yard.