(Encyclopedia) magnesia, common name for the chemical compound magnesium oxide, MgO. It occurs as colorless, cubic crystals. It is refractory, melting at about 2,800℃. It is very slightly soluble in…
(Encyclopedia) magnetitemagnetitemăgˈnətīt [key], lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores…
(Encyclopedia) Lang, Cosmo Gordon, 1864–1945, English churchman, archbishop of York (1908–28), archbishop of Canterbury (1928–42), b. Aberdeen, Scotland. From 1901 to 1908, while suffragan bishop of…
(Encyclopedia) marcasitemarcasitemärˈkəsīt [key] or white iron pyrites, a mineral closely resembling and having the same chemical composition (FeS2) as pyrite. It differs from pyrite in that it is…
(Encyclopedia) petunia, any plant of the genus Petunia, South American herbs of the family Solanaceae (nightshade family). The common garden petunias, planted also in window boxes, are all considered…
(Encyclopedia) Athanasian CreedAthanasian Creedăthənāˈzhən [key], exact, elaborate Roman Catholic statement on the Trinity and the Incarnation. It is no longer believed to have been written by…
(Encyclopedia) Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned. It consists of two flasks, one placed inside the other, with a vacuum between. The…
(Encyclopedia) divining rod or dowser, stick used in searching for underground water or minerals. This form of divination is still in common use in many parts of the world. The instrument is…
(Encyclopedia) AhijahAhijahəhīˈjə [key], common name in the Bible, occasionally spelled Ahiah. 1 Prophet from Shiloh. 2 Priest in the time of Saul, perhaps the same as Ahimelech (1.) 3 One of David's…
(Encyclopedia) Cortissoz, RoyalCortissoz, Royalkôrtēˈsōz [key], 1869–1948, American critic and lecturer on art. He was the New York Herald Tribune art critic from 1891 and was noted for his lectures…
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