mainmast

[meyn-mast, -mahst; Nautical meyn-muhst]
noun Nautical.
1.
the second mast from forward in any ship having two or more masts, except for a yawl, ketch, or dandy. See illus. under quarterdeck.
2.
the larger forward mast of a yawl, ketch, or dandy.
3.
the sole mast of any of various ships, as sloops or cutters.

Origin:
1475–85; main1 + mast1

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World English Dictionary
mainmast (ˈmeɪnˌmɑːst)
 
n
nautical the chief mast of a sailing vessel with two or more masts, being the foremast of a yawl, ketch, or dandy and the second mast from the bow of most others

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Aft, and adjacent to the mainmast are four additional, enclosed berths.
The trestletree attached the mainmast to the topmast of schooners.
The roof is surmounted by a modern radar on a short mast and a short mainmast
  with lights mounted atop.
The mainmast was clipped off during this engagement.
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