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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. ...seignorial system
(Encyclopedia)seignorial system: see manorial system; feudalism. ...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 ...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...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 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...urinary system
(Encyclopedia) CE5 Urinary system urinary system, group of organs of the body concerned with excretion of urine, that is, water and the waste products of metabolism. In humans, the kidneys are two small organs s...endocrine system
(Encyclopedia)endocrine system ĕnˈdəkrĭn [key], body control system composed of a group of glands that maintain a stable internal environment by producing chemical regulatory substances called hormones. The end...Browse by Subject
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