Said of a distant ship when her hull is below horizon and her masts and upper works are visible.

A method of storing a sail, e.g., by rolling the jib around the headstay.

An attachment point for another object.

Cubic feet per minute (cfm) of air required at the inlet to the distribution system.

Electro-mechanical steering device; an instrument designed to control automatically a vessel's steering gear so that she follows a pre-determined track through the water.

On square-rigged ships, an additional sail set in good weather outside the square sails when the wind was abaft the beam.

The standard atmosphere is defined as the pressure exerted by a column of mercury 760 mm high with a density of 13,595 g/cm

Sailing in the same direction as the wind with the wind coming from the stern.

The north end of the earth's axis and also called North Geographic Pole. The direction indicated by 000

The distance the ship's side falls in towards the center line above the load water line. Opposite of flare.

Old seafaring term meaning something very difficult or awkward. see Devil

Air pressure

The locker in which the bos'n keeps his deck gear.

The maximum rate at which an engine can do work as measured by the resistance of an applied brake. Expressed in horsepower.

The distance from the surface of the water to the main deck or gunwale.

A multihulled boat with three hulls.

Vibration isolation mount. Provides reductions in vibration transmission.

Old Latin name for the south wind.

To haul on a rope, to haul up tight, to hoist the last possible inch or so.

To turn the boat away from the wind. Also, Fall Off. The opposite of heading up.