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pit viper

(Encyclopedia)pit viper, poisonous snake of the family Crotalidae, primarily a New World family. Like the Old World true vipers (family Viperidae), pit vipers have long, hollow, erectile fangs that are folded back ...

physical education and training

(Encyclopedia)physical education and training, organized instruction in motor activities that contribute to the physical growth, health, and body image of the individual. The historical roots of physical education ...

buffalo, in zoology

(Encyclopedia)buffalo, name commonly applied to the American bison but correctly restricted to certain related African and Asian mammals of the cattle family. The water buffalo, or Indian buffalo, Bubalus bubalis, ...

aircraft carrier

(Encyclopedia)aircraft carrier, ship designed to carry aircraft and to permit takeoff and landing of planes. The carrier's distinctive features are a upper deck (flight deck) that is flat and sometimes sloped to fu...

sweating system

(Encyclopedia)sweating system, method of exploiting labor by supplying materials to workers and paying by the piece (see piecework) for work done on those materials in the workers' homes or in small workshops (swea...

swift

(Encyclopedia)swift, common name for small, swallowlike birds related to the hummingbird and found all over the world, chiefly in the tropics. They range in size from 6 to 12 in. (15–30 cm) in length. Swifts have...

sword

(Encyclopedia)sword, weapon of offense and defense in personal combat, consisting of a blade with a sharp point and one or two cutting edges, set in a hilt with a handle protected by a metal case or cross guard. Th...

valerian, in botany

(Encyclopedia)CE5 Valerian, Valeriana officinalis valerian, common name for some members of the Valerianaceae, a family chiefly of herbs and shrubs of temperate and colder regions of the Northern Hemisphere; a ...

vagrancy

(Encyclopedia)vagrancy, in law, term applied to the offense of persons who are without visible means of support or domicile while able to work. State laws and municipal ordinances punishing vagrancy often also cove...

Tsin

(Encyclopedia)Tsin or Chin both: jhĭn [key], dynasty of China that ruled from 265 to 420, after the period of the Three Kingdoms. It was divided into two phases: the Western Tsin (265–317) and the Eastern Tsin (...