- main-staysail
- main-tack block
- main-tackle
- main-tackle pendant
- main-top bowline
- main-topsail haul!
- main-transom
- main-wales
- main-yard men
- maister
- maize
- major
- major axis
- major-general
- major of brigade
- make, to
- make a good board
- make a lane there!
- make bad weather, to
- make fast
- make free with the land, to
- make head-way
- make it so
- make lee-way, to
- make ready!
- makes
- make sail, to
- make stern-way, to
- make the land, to
- make water, to
- making iron
- making off
- mala fides
- malduck
- malkin
- malingerer
- mallard
- mollymauk
- mallemak
- mallemaroking
- mallet
- mallow
- maltha
- man
- man, to
- man, isle of, battery
- manacle
- manarvel, to
- manatee
- manati
- man-bound
- man-broker
- manby's mortar
- manche of mangalore
- manchineel
- mandarin
- mandilion
- mandril
- manger
- mangonel
- mangonize, to
- man-handle, to
- man-hole
- man-hunting
- manifest
- manilla rope
- maniple
- manœuvre
- man-of-war
- man-of-war bird
- man-of-war fashion
- man-of-war's man
- manometer
- man overboard!
- man ship!
- mansions of the moon
- mantillis
- mantlets
- manual-exercise
- manubalist
- manxman
- manzera
- mar
- marabut
- marches
- marching order
- marco-banco
- mare's tails
- margin line
- marinarius
- marinate, to
- marine
- marine barometer
- marine boards
- marine buildings
- marine clothing-room
- marine engines
- jeffrey's glue
- marine glue
- marine insurance