topmast

[top-mast, -mahst; Nautical top-muhst]
noun Nautical.
the mast next above a lower mast, usually formed as a separate spar from the lower mast and used to support the yards or rigging of a topsail or topsails.

Origin:
1475–85; top1 + mast1

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World English Dictionary
topmast (ˈtɒpˌmɑːst, nautical ˈtɒpməst)
 
n
the mast next above a lower mast on a sailing vessel

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The trestletree attached the mainmast to the topmast of schooners.
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