see Chanty.

The piston only compresses air with its stroke in one direction.

A filter element whose medium consists of a series of uniform folds and has the geometric form of a cylinder, cone, disc, plate ... Synonymous with "convoluted" and "corrugated".

The pressure that would be produced by stopping a moving stream of liquid or gas.

Small, circular sheets of newly-formed ice that do not impede navigation.

Heavy canvas used as a covering.

A valve which enables pressure to be reduced, or kept constant at a desired level.

Said of a vessel's anchor, or cable when the amount of cable out is not more than one-and-a-half times the depth of water.

Arrangements with a carrier for the acceptance and carriage of freight; i.e., a space reservation.

See CFS.

Galley smokestack or chimney.

A blast of from 4 to 6 seconds' duration.

A block with a single sheave which is hinged and opens on the side so that the bight of a line can be led into the block and closed without running the whole length through

A vessel's station bill showing duties of crew.

The renting of a boat

Also known as (U.S.) Federal Bill of Lading Act of 1916. U.S. federal law enacting conditions by which a B/L may be issued. Penalties for issuing B/L's containing false data include monetary fines and/or imprisonment.

A rope sewn into the luff or foot of a sail for use in attaching to the mast or boom.

In sailboat racing, to take to opposite tack of the rest of the fleet when behind, hoping that the wind will shift to your benefit.

A distress call made by a vessel requiring assistance. These three letters were chosen because they were easy to make and read using Morse Code. Some believe the letters meant "Save Our Ship" or "Save Our Souls".

The senior engineer officer responsible for the satisfactory working and upkeep of the main and auxiliary machinery and boiler plant on board ship.