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mainmast (n.)

also main-mast, "the tallest mast in a sailing ship," late 15c., from main (adj.) + mast (n.1). In three-masted vessels, the middle mast; in four-masted ships the second from the bow.

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Definitions of mainmast from WordNet

mainmast (n.)
the chief mast of a sailing vessel with two or more masts;
From wordnet.princeton.edu