n. The chief, and tallest mast of a sailing ship that has more than one mast.
the GNU version of the Collaborative International Dictionary of English
n. The principal mast in a ship or other vessel.
The Century Dictionary and Cyclopedia
n. Nautical, the principal mast in a ship or other vessel.
n. plural The lower topmast and topgallantmasts of the mast next abaft the foremast.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the chief mast of a sailing vessel with two or more masts
Word Usage
"Fastened by chains to the mainmast were a number of grisly staghounds, who now began leaping and barking at me, and by the mizzen a huge puma was cramped in a little iron cage far too small even to give it turning room."