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A hard shelled (usually) aquatic animal; the crab, lobster etc.



Related Terms

LOBSTER

A marine crustacean with pincer-like claws. Historical slang for red coated Imperial soldiers.

ABSOLUTE FILTRATION RATING

The diameter of the largest hard spherical particle that will pass through a filter under specified test conditions. This is an indication of the largest opening in the filter elements.

FORAMINIFERA

Small, single-cell, jellylike marine animals with hard shells of many chambers. In some areas the shells of dead for- aminifera are so numerous they cover the ocean bottom.

HARDTACK

A hard and long-lasting dry biscuit, used as food on long journeys. Also called ship's biscuit.

TACTICAL DIAMETER

The perpendicular distance between a ship's course when the helm is put hard over and her course when she has turned through 180 degrees; the ratio of the tactical diameter divided by the ship's length between perpendiculars gives a dimensionless parameter which can be used to compare the manoeuverability of ships.

CARD

An element of a computer consisting of the hard surface on which components are mounted. A completed card performs one or more specific functions, such as graphics.

HARD

A section of otherwise muddy shoreline suitable for mooring or hauling out.

HARD BEACH

A portion of a beach especially prepared with a hard surface extending into the water, employed for the purpose of loading or unloading directly into landing ships or landing craft

ICE PELLETS

A type of precipitation consisting of transparent or translucent pellets of ice, 5 millimeters or less in diameter. The pellets may be spherical, irregular, or (rarely) conical in shape. They usually bounce when hitting hard ground, and make a sound upon impact. Ice pellets includes two basically different types of precipitation, those which are known in the United States as SLEET and SMALL HAIL. Sleet is generally transparent, globular, solid grains of ice which have formed from the freezing of raindrops or the refreezing o

CUTTING WEAR

Comes about when hard surface asperities or hard particles that have embedded themselves into a soft surface and plough grooves into the opposing harder surface, e.g., a journal.

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