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spastic paralysis

(Encyclopedia)spastic paralysis, form of paralysis in which the part of the nervous system that controls coordinated movement of the voluntary muscles is disabled. In spastic paralysis the nerves controlling muscle...

Congo, river, Africa

(Encyclopedia)Congo zīˈēr, zäērˈ [key], great river of equatorial Africa, c.2,720 mi (4,380 km) long, formed by the waters of the Lualaba River and its tributary, the Luvua River, and flowing generally N and ...

Jupiter, in astronomy

(Encyclopedia)Jupiter jo͞oˈpətər [key], in astronomy, 5th planet from the sun and largest planet of the solar system. Astronomers have discovered 79 satellites orbiting Jupiter, but five of those, small sate...

domestic service

(Encyclopedia)domestic service, work performed in a household by someone who is not a member of the family. It was performed by slaves in many early civilizations, e.g., in Greece and Rome. Under the feudal system ...

encomienda

(Encyclopedia)encomienda ānkōmyānˈdä [key] [Span. encomendar=to entrust], system of tributory labor established in Spanish America. Developed as a means of securing an adequate and cheap labor supply, the enco...

school vouchers

(Encyclopedia)school vouchers, government grants aimed at improving education for the children of low-income families by providing school tuition that can be used at public or private schools. The idea behind schoo...

subtreasury

(Encyclopedia)subtreasury. After President Andrew Jackson vetoed (July 10, 1832) the bill to recharter the Second Bank of the United States, the deposits were removed and placed in state banks that came to be calle...

zero

(Encyclopedia)zero, that number which, when added to any number, leaves the latter unchanged; its symbol is 0. The introduction of zero into the decimal system was the most significant achievement in the developmen...

Gabelsberger, Franz Xaver

(Encyclopedia)Gabelsberger, Franz Xaver fränts ksävĕrˈ gäˈbəlsbĕrˌgər [key], 1780–1849, German stenographer. He invented a popular German shorthand system. ...

neuron

(Encyclopedia)neuron, specialized cell in animals that, as a unit of the nervous system, carries information by receiving and transmitting electrical impulses. ...