An invertebrate with a soft body and hard external shell; snails, oysters, mussels, etc.

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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.


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


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


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


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


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.


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.


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.


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.


A soft, slimy, organic sediment covering part of the ocean bottom, composed principally of shells or other hard parts of minute organ- isms.

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