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locust, in zoology

(Encyclopedia) locust, in zoology, name for certain migratory members of the short-horned grasshopper family (Acrididae). Like other members of this family, locusts have antennae shorter than their…

depression, in economics

(Encyclopedia) depression, in economics, period of economic crisis in commerce, finance, and industry, characterized by falling prices, restriction of credit, low output and investment, numerous…

depression, in psychiatry

(Encyclopedia) depression, in psychiatry, a symptom of mood disorder characterized by intense feelings of loss, sadness, hopelessness, failure, and rejection. The two major types of mood disorder are…

Algol, in astronomy

(Encyclopedia) AlgolAlgolălˈgŏl [key], famous variable star in the constellation Perseus; Bayer designation β Persei; 1992 position R.A. 3h07.7m, Dec. +40°55′. Algol's variation in apparent magnitude…

diet, in nutrition

(Encyclopedia) diet, food and drink regularly consumed for nourishment. Nutritionists generally recommend eating a wide variety of foods; however, some groups of people survive on a very limited diet…

dimension, in mathematics

(Encyclopedia) dimension, in mathematics, number of parameters or coordinates required locally to describe points in a mathematical object (usually geometric in character). For example, the space we…

dimension, in physics

(Encyclopedia) dimension, in physics, an expression of the character of a derived quantity in relation to fundamental quantities, without regard for its numerical value. In any system of measurement…

Dione, in astronomy

(Encyclopedia) DioneDionedīōˈnē [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn IV (or S4), Dione is 695 mi (1,120 km) in diameter, orbits Saturn…