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Peregrinus, Petrus
(Encyclopedia)Peregrinus, Petrus (Peter the Pilgrim) pēˈtrəs pĕrəgrĭnˈəs [key], c.1220–?, medieval scholar and soldier. The tutor of Roger Bacon, he wrote the first important study of magnetism, Epistola ...Pacher, Michael
(Encyclopedia)Pacher, Michael mĭkhˈäĕl päˈkhər [key], c.1435–1498, German religious painter and probably a wood carver, a native of the Tyrol. He painted figures reminiscent of the art of Mantegna, whose w...fifth force
(Encyclopedia)fifth force, postulated fifth basic force of nature (the four known forces of nature are gravity, electromagnetism, and the strong and weak interactions). Proposed in 1986 to account for gravitational...Cressy, Hugh Paulinus
(Encyclopedia)Cressy, Hugh Paulinus krĕˈsē [key], 1605–74, English Benedictine monk. He was educated at Oxford and converted to Roman Catholicism in Rome in 1646. His Exomologesis (1647) is an apologia for his...chart
(Encyclopedia)chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as indications of d...pen
(Encyclopedia)pen, pointed implement used in writing or drawing to apply ink or a similar colored fluid to any surface, such as paper. Various kinds of pens have been used since ancient times. Reeds that were slit ...molar volume
(Encyclopedia)molar volume, the volume occupied by a mole of a substance at STP. According to Avogadro's law, at a given temperature and pressure a given volume of any gas contains the same number of molecules. At ...neoteny
(Encyclopedia)neoteny nēŏtˈənē [key], in biology, sexual maturity reached in the larval stage of some animals. Certain environmental conditions can inhibit the completion of metamorphosis; low temperature or l...kiln
(Encyclopedia)kiln kĭl, kĭln [key], furnace for firing pottery and enamels, for making brick, charcoal, lime, and cement, for roasting ores, and for drying various substances (e.g., lumber, chemicals). Kilns may ...Browse by Subject
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