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Empedocles
(Encyclopedia)Empedocles ĕmpĕdˈəklēz [key], c.495–c.435 b.c., Greek philosopher, b. Acragas (present Agrigento), Sicily. Leader of the democratic faction in his native city, he was offered the crown, which h...earth, in chemistry
(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...pluralism
(Encyclopedia)pluralism, in philosophy, theory that considers the universe explicable in terms of many principles or composed of many ultimate substances. It describes no particular system and may be embodied in su...Democritus
(Encyclopedia)Democritus dĭmŏkˈrĭtəs [key], c.460–c.370 b.c., Greek philosopher of Abdera; pupil of Leucippus. His theory of the nature of the physical world was the most radical and scientific attempted up ...Anaxagoras
(Encyclopedia)Anaxagoras ănˌəksăgˈərəs [key], c.500–428 b.c., Greek philosopher of Clazomenae. He is credited with having transferred the seat of philosophy to Athens. He was closely associated with many f...Arnold, Matthew
(Encyclopedia)Arnold, Matthew, 1822–88, English poet and critic, son of the educator Dr. Thomas Arnold. Arnold was educated at Rugby; graduated from Balliol College, Oxford in 1844; and was a fellow of Oriel Coll...transmigration of souls
(Encyclopedia)transmigration of souls or metempsychosis mətĕmˌsəkōˈsĭs [key] [Gr.,=change of soul], a belief common to many cultures, in which the soul passes from one body to another, either human, animal, ...matter
(Encyclopedia)matter, anything that has mass and occupies space. Matter is sometimes called koinomatter (Gr. koinos=common) to distinguish it from antimatter, or matter composed of antiparticles. The atomic th...evolution
(Encyclopedia)CE5 Plant and animal evolution [Modified from Alfred Gunderson in Brooklyn Botanic Garden Leaflets, Ser. 18, No. 4 (1930); used by permission.] evolution, concept that embodies the belief that ex...medicine
(Encyclopedia)medicine, the science and art of treating and preventing disease. Modern medicine, characterized by growing specialization and a complex diagnostic and therapeutic technology, faces problems in the...Browse by Subject
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