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radar

(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...

breeding

(Encyclopedia)breeding, in agriculture and animal husbandry, propagation of plants and animals by sexual reproduction; usually based on selection of parents with desirable traits to produce improved progeny. In con...

Sitwell

(Encyclopedia)Sitwell, English literary family, one of the most celebrated literary families of the 20th cent. Its members included Dame Edith Sitwell, 1887–1964, English poet and critic, Sir Osbert Sitwell, 1892...

programming language

(Encyclopedia)programming language, syntax, grammar, and symbols or words used to give instructions to a computer. Once the program is written and has had any errors repaired (a process called debugging), it may ...

fats and oils

(Encyclopedia)fats and oils, group of organic substances that form an important part of the diet and also are useful in many industries. The fats are usually solid, the oils generally liquid at ordinary room temper...

Old Norse literature

(Encyclopedia)Old Norse literature, the literature of the Northmen, or Norsemen, c.850–c.1350. It survives mainly in Icelandic writings, for little medieval vernacular literature remains from Norway, Sweden, or D...

castle

(Encyclopedia)castle, type of fortified dwelling characteristic of the Middle Ages. Fortification of towns had been in practice since antiquity, but in the 9th cent. feudal lords began to develop the private fortre...

surveying

(Encyclopedia)surveying, method of determining accurately points and lines of direction (bearings) on the earth's surface and preparing from them maps or plans. Boundaries, areas, elevations, construction lines, an...

rabbit

(Encyclopedia)rabbit, name for herbivorous mammals of the family Leporidae, which also includes the hare and the pika. Rabbits and hares have large front teeth, short tails, and large hind legs and feet adapted for...

refrigeration

(Encyclopedia)CE5 Compression system of refrigeration refrigeration, process for drawing heat from substances to lower their temperature, often for purposes of preservation. Refrigeration in its modern, portabl...