One of the mysteries of the English language finally explained.
A topgallant situated just above the head of the maintopmast. Chiefly in compounds: "main-topgallant-crosstree", "main-topgallant-masthead", "main-topgallant-sail", "main-topgallant-yard", etc. "main-topgallant-mast"noun the mast above the maintopmast.
Late 16th century. From main + topgallant.
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