Meanings
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1
noun
the principal mast of a vessel with two or more masts, usually the tallest and, on many sailing ships, the second from the bow
The square sails on the mainmast drew steadily in the following wind.
Thesaurus
Etymology
Formed from main + mast. In sailing terminology, main identifies the vessel's principal mast, commonly the tallest mast and often the second mast from the bow on a full-rigged ship.