[top.gal.lant] adj [[1]top +
[2]gallant] (1514): of, relating to, or being a part next above the topmast and below the royal mast "~ sails" "the ~ mast"
[2]topgallant n (1581) 1 archaic: the topmost point: summit "the high ~ of my joy --Shak."
2: a topgallant mast or sail