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mizen-topgallant

ˈmizen-topˈgallant Naut.
  Used attrib. in mizen-topgallant-mast, the mast above the mizen-topmast; similarly in mizen-topgallant brace, mizen-topgallant-mast-head, mizen-topgallant-sail, mizen-topgallant-yard, etc.

1864 Chamb. Encycl. s.v., Above it [sc. the mizen-mast], are the mizen-topmast, the mizen-top-gallant-mast, and the mizen-royal. 1875 Bedford Sailor's Pocket Bk. vii. (ed. 2) 260 When she is immediately to hoist her ensign at the mizen top-gallant mast-head.

Oxford English Dictionary

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