To let go.

Order to pick up goods at a named place and deliver them to a pier. Usually issued by exporter to trucker but may apply to a railroad, which completes delivery by land. Use is limited to a few major U.S. ports. Also known as shipping delivery order.

The resistance to movement. (2) An anchor drags when its flukes do not hold.

A sailboat with its bow pointed directly into the wind, preventing the sails from filling properly and stopping the boat. It can be very difficult to get a boat that is in irons back under sail. also known as "In Stays".

The bottom of the mast, with a shape designed to fit into the mast step.

The top of the mast

Sailing downwind with the wind blowing over the leeward side of the boat, increasing the possibility of an unexpected jibe.

Additive that promotes the formation of a stable mixture, or emulsion, of oil and water. Common emulsifiers are: metallic soaps, certain animal and vegetable oils, and various polar compounds.

The ratio of the indicated power to shaft input.

Land

Above this pressure, the system may rupture or burst.

A semi great circle joining the north and south poles. Known as lines of longitude, they cross the equator and all parallels of latitude at right angles.

Melting and becoming a liquid by absorbing moisture.

A trade arrangement in which goods are shipped to a foreign buyer without guarantee of payment.

Originally, to suck rum from a coconut, the end of the nut resembling a monkey's face. Later, illicitly to suck spirit from a cask, usually through a straw. Also called Bleed the Monkey.

In blue water beyond the 100-fathom line.

Limber hole of a ship.

Sails that are not properly arranged for the point of sail that the boat is on. The sails may be luffing or have improper sail shape, or the boat may be heeling too much. These conditions will slow the boat down.

Name given to the metal point or ram fixed on the bows of old war galleys and used to pierce the hulls, and thus sink or disable enemy ships.

A place where boats can find fuel, water and other services. Marinas also contain slips where boats can stay for a period of time.