(nautical) Situated above the topmast and below the royal mast.the topgallant yards, braces, etc.
Of the most superior quality; the best of its kind.
L'EstrangeThe consciences of topgallant sparks.
1851, Herman Melville, ,Delight, — top-gallant delight is to him, who acknowledges no law or lord, but the Lord his God, and is only a patriot to heaven.