The distance between the water level at chart datum and an overhead obstacle such as a bridge or power line.

The motion of air relative to a body in it.

The distance between a rope's adjacent strands, giving a measure of the tightness of the lay. The shorter the distance, the harder the lay. When a line has been overused and the lay has become slack, it is said to be slack-jawed.

A mythical creature, half human and half fish.

An entry that allows foreign merchandise arriving at one port to be exported from the same port without the payment of duty.

A yard or pole extending the head or foot of the topsail beyond the topmast or gaff of a gaff-rigged boat

Is the pressure exerted by a vapor confined within a given space. The vapor may be the sole occupant of the space, or may be associated with other gases.

A thermal expansion valve.

A type of anchor with a heavy inverted mushroom shaped head. Mushroom anchors are used to anchor in mud and other soft ground.

Slang name for the Q Flag. Also an old term for yellow fever.

A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. Reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption.

A sliding type of bearing having either rotating or oscillatory motion and in conjunction with which a journal operates. In a full or sleeve type bearing, the bearing surface is 360 degrees in extent. In a partial bearing, the bearing surface is less than ...

A method of preventing the ends of a line from unlaying or fraying by turns of small stuff, stout twine or seizing wire with the ends tucked.

A term indicating a temperature relationship between two temperatures or temperature variation between two points.

(1) To float a vessel off the ways in a building yard after it is completed. (2) A small boat used to ferry people to and from a larger vessel.

Before the introduction of man-made fibers, much of the rope used at sea was made from manila. Made from the fibers of banana plants in the Philippines, manila did not rot when it was exposed to seawater.

Away from land, toward the water.

To bring a sailing vessel head to the wind or as close to it as possible in high seas, maintaining a slight forward motion.

Standing or running (adjustable) wire rigging that supports the mast from the stern; a wire mast support leading aft to the deck or another mast