topgallant /tɒpˈɡælənt/noun 3adjective 2forms 3 noun3 •The sail suspended from the topmost section of a mast. •The topmost section of a mast; topgallant mast. •Anything elevated or splendid. adjective2 •Situated above the topmast and below the royal mast.the topgallant yards, braces, etc. •Of the most superior quality; the best of its kind.The consciences of top-gallant sparks. — 1692 formstopgallants · more topgallant · most topgallant