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apostomatida

Science; General science

A little-studied group of ciliates comprising an order of the Holotrichia. The majority occur as commensals on marine crustaceans. This association is generally more intimate ...

aneurysm

Science; General science

A localized, abnormal arterial dilation usually caused by a weakening of the vessel wall. Aneurysms are commonly found in the abdominal aorta, intracranial arteries, and thoracic ...

decibel

Science; General science

A logarithmic unit used to express the magnitude of a change in level of power, voltage, current, or sound intensity. A decibel (dB) is 1/√ 10 bel.

rope

Science; General science

A long flexible structure consisting of many strands of wire, plastic, or vegetable fiber such as manila. Rope is classified as a flexible connector and is used generally for ...

escarpment

Science; General science

A long line of cliffs or steep slopes that break the general continuity of the land by separating it into two level or sloping surfaces. Some very high escarpments, or scarps, ...

deep-sea trench

Science; General science

A long, narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides. Oceanic trenches characterize active margins at the ...