On square-rigged ships, a small light square sail set above the skysail in fair weather. If the sail were triangular, it would be called a Skyscraper.

Seaman's name for a reef knot tied upside down. also called a "granny" knot.

Said of a vessel when forced to heave to or lie at anchor due to fog.

Filtration that occurs at the surface layer (as opposed to within the body depth) of the filter, and is accomplished by passing the material to be filtered over a grating, screen, sieve or membrane fabric with micro sized holes. The size of the holes in t ...

A block and tackle attached to the boom and the deck to prevent the main from gybing when sailing downwind

A call on the bo'sun's pipe at night for the hands to turn in, for silence in the messdecks, and for lights to be extinguished. Also a term used by a sailor to another to make them stop talking.

The moisture content of air.

Shipper's instructions to carrier for forwarding goods; usually the triplicate copy of the bill of lading.

Compartment in the hold of a containership into which a shipping container fits exactly.

A round wood plug inserted in a hole to cover a nail, screw, or bolt.

Clearance by the Health Authorities.

A rest for a cargo-boom when lowered for securing for sea.

The power required at the compressor drive shaft. Losses in external transmissions such as gears and belt drives are not included.

An ocean carrier company operating vessels not on regular runs or schedules. They call at any port where cargo may be available.

To leave; to push a boat away from a pier or vessel's side.

A device designed to enable accumulated liquids to be held for draining in a compressed air system.

A group of vessel operators joined together for the purpose of establishing freight rates.

Used in meteorology to describe boundaries between hot and cold air masses. This is typically where bad weather is found.

The relative humidity of a gas (or air) vapor mixture is the ratio of the partial pressure of the vapor to the vapor saturation pressure at the dry bulb temperature of the mixture.

To throw an oar out of the rowlock, and raise it perpendicularly on its end, and lay it down in the boat, with its blade forward.