/miz"euhn mast', -mahst'/ ; Naut. /miz"euhn meuhst/ , n. Naut.
1. the third mast from forward in a vessel having three or more masts. See illus. under quarterdeck .
2. the after and shorter mast of a yawl, ketch, or dandy; jiggermast.
Also, mizenmast .
[ 1375-1425; late ME meson mast. See MIZZEN, MAST 1 ]