A trailer or semi-trailer with no sides and with the floor of the unit close to the ground.

A sudden, significant increase in station pressure.

Frozen or partly frozen rain.

To touch bottom.

To take a boat into water that is too shallow for it to float in, i.e: the bottom of the boat is resting on the ground.

On a square-rigged ship, a small triangular sail set above the skysail in fair weather. A square version is called a Moonraker.

To double a vessel's mooring lines.

A commonly used analysis for reporting fuel properties; may be on a dry (moisture free) basis, as "fired", or on an ash and moisture free basis. Fractions usually reported include: volatile matter, fixed carbon, moisture, ash, and heating value (higher he ...

Machines in which air or gas is compressed from initial pressure to an intermediate pressure in one or more cylinders or casings.

The total distribution of electromagnetic radiation emanating from the sun. The different regions of the solar spectrum are described by their wavelength range. The visible region extends from about 390 to 780 nanometers (a nanometer is one billionth of o ...

(ERM)The mechanism by which members of the EC formerly operated their currency exchange rates within.

A short length of rope secured at one end, and used in securing or checking a running rope, e.g., deck stopper, boat fall stopper, etc.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

A steady-state fermentation process.

Tables prepared from the psychrometric formula and used to obtain vapor pressure, relative humidity, and dew point from values of wet-bulb and dry-bulb temperatures.

Loss of effective propeller thrust caused by the blades cutting across the column of water sucked along by the propeller instead of working in it. Can also lead to heavy vibration of the vessel.

The horsepower calculated from compressor-indicator diagrams. Applied only to displacement type compressors.

A safety device used to prevent or stop unwanted flames.

Said of a boat which turns end over end in very rough seas.

Sudden and rapid flow of tide in certain rivers and estuaries which rolls up in the form of a wave. also known as Eagre.