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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...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 all members of ...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 ...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...borstal system
(Encyclopedia)borstal system bôrˈstəl [key], rehabilitation method formerly used in Great Britain for delinquent boys aged 16 to 21. The idea originated (1895) with the Gladstone Committee as an attempt to refor...Browse by Subject
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