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portal system

(Encyclopedia) portal system: see circulatory system.

Bach system

(Encyclopedia) Bach system: see Bach, Alexander.

solar system

(Encyclopedia) CE5 Solar system CE5 solar system, the sun and the surrounding planets, natural satellites, dwarf planets, asteroids, meteoroids, and comets that are bound by its gravity. The…

spoils system

(Encyclopedia) spoils system, in U.S. history, the practice of giving appointive offices to loyal members of the party in power. The name supposedly derived from a speech by Senator William Learned…

steering system

(Encyclopedia) steering system, in automobiles, steering wheel, gears, linkages, and other components used to control the direction of a vehicle's motion. Because of friction between the front tires…

banner system

(Encyclopedia) banner system, Manchu conscription system. Companies of Manchu warriors were grouped (1601) into brigades, each with a distinctive banner. The banner system integrated former tribal…

Ptolemaic system

(Encyclopedia) Ptolemaic systemPtolemaic systemtŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the…

nervous system

(Encyclopedia) CE5 Nerve cell CE5 Nervous system nervous system, network of specialized tissue that controls actions and reactions of the body and its adjustment to the environment. Virtually…