topgallantPronunciation: /tɒpˈgal(ə)nt, təˈgal-/Definition of topgallant noun (also topgallant mast) the section of a square-rigged sailing ship’s mast immediately above the topmast. (also topgallant sail) a sail set on a topgallant mast. topgallant in other Oxford dictionaries Definition of topgallant in the US English dictionary
