A law of chemistry and physics: the rate of diffusion of one substance in another is proportional to the negative gradient of the concentration of the first substance.

A hand held pneumatic tool. Designed for light demolition work, digging, making holes etc.

A lubricating oil made with synthetic base stocks.

A line led to a sail, but is not currently in use. The line currently in use is known as the working sheet. Usually the working and lazy sheets change when the boat is tacked.

Direct current. A continuous, one directional flow of electricity

Circular iron band used to hold a bowsprit on the stem of a sailing vessel.

United Nations EDI for Administration, Commerce and Transport. EDI Standards are developed and supported by the UN for electronic message (data) interchange on an international level.

Ropes hung and used for assistance in ascending and descending.

A container frame fitted to accommodate two or more separate tanks for liquids.

To stand at the mast and pull down on a halyard as another crewmate winches it in.

In sailing, to be lifted by a wind shift that allows your boat to be lifted closer to the wind where by it allows you to sail a shorter distance to the next mark, buoy or finish line

Those frames of a ship's hull which are equal in area, one forward and one aft of the ship's center of gravity.

Rolling a vessel, that is slightly ice-bound, so as to break the surface ice around her. May sometimes be done when a vessel is lightly aground, but not ice-bound.

Uncharted navigational danger that has been reported but has not been verified by survey.

A rope used for securing any movable object in place

Slang for getting married. A splice joins two lines together permanently.

The Captain of a vessel. Highest officer aboard ship. Oversees all ship operations. Keeps ships records. Handles accounting and bookkeeping. Takes command of vessel in inclement weather and in crowded or narrow waters. Handles communications.

CFM flowing through the compressor inlet filter or inlet valve under rated conditions

(1) To throw, as to heave a line ashore. (2) An upward pull on a line; to lift (3) The rise and fall of a vessel in a seaway.

A boat is double banked, when two oars, one opposite the other, are pulled by men seated on the same thwart.