the GNU version of the Collaborative International Dictionary of English
n. mizzenmast.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
Word Usage
"A glance up the hatchway showed the giant that the arms he had planned to seize were defended by ten firelocks, and that, behind the open doors of the partition which ran abaft the mizenmast, the remainder of the detachment stood to their arms."