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portal system
(Encyclopedia)portal system: see circulatory system. ...planetary system
(Encyclopedia)planetary system, a star and all the celestial bodies bound to it by gravity, especially planets and their natural satellites. Until the last decade of the 20th cent., the only planetary system known ...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 units into a burea...reproductive system
(Encyclopedia)CE5 Reproductive system reproductive system, in animals, the anatomical organs concerned with production of offspring. In humans and other mammals the female reproductive system produces the femal...respiratory system
(Encyclopedia)respiratory system: see respiration. ...Ptolemaic system
(Encyclopedia)Ptolemaic system tŏlˌəmāˈĭk [key], historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with a...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 sun is by far 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 Marcy in which he...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 and the road, es...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...Browse by Subject
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