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Master Honoré

(Encyclopedia)Master Honoré ōnôrāˈ [key], French manuscript illuminator, active c.1288–1318. Honoré worked in Paris for the court of Philip the Fair (1285–1314). A breviary (Bibliothèque nationale) made ...

clerestory

(Encyclopedia)CE5 Clerestory clerestory or clearstory both: klĭrˈstōrˌē, –stôrˌē [key], a part of a building whose walls rise higher than the roofs of adjoining parts of the structure. Pierced by wind...

Hevesy, Georg von

(Encyclopedia)Hevesy, Georg von gāˈôrkh fən hĕˈvĕshē [key], 1885–1966, Hungarian physicist and chemist. He received the 1943 Nobel Prize in Chemistry for his work on the use of isotopes as tracers in stud...

W

(Encyclopedia)W, 23d letter of the alphabet, in form a doubled u or v. It is the usual symbol of a voiced bilabial semivowel, as in the English wing. The same semivowel occurs as second member of the dipthongs au (...

actinium

(Encyclopedia)actinium ăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp. gr. 10.07;...

selenium

(Encyclopedia)selenium səlēˈnēəm [key], nonmetallic chemical element; symbol Se; at. no. 34; at. wt. 78.96; m.p. 217℃; b.p. about 685℃; sp. gr. 4.81 at 20℃; valence −2, +4, or +6. Selenium is directly ...

radioactive isotope

(Encyclopedia)radioactive isotope or radioisotope, natural or artificially created isotope of a chemical element having an unstable nucleus that decays, emitting alpha, beta, or gamma rays until stability is reache...

oxide

(Encyclopedia)oxide, chemical compound containing oxygen and one other chemical element. Oxides are widely and abundantly distributed in nature. Water is the oxide of hydrogen. Silicon dioxide is the major componen...

gallium

(Encyclopedia)gallium gălˈēəm [key], metallic chemical element; symbol Ga; at. no. 31; at. wt. 69.723; m.p. 29.78℃; b.p. 2,403℃; sp. gr. 5.904 at 29.6℃ (solid), 6.095 at 29.8℃ (liquid); valence +2 or +3...

Spender, Sir Stephen

(Encyclopedia)Spender, Sir Stephen, 1909–95, English poet and critic, b. London. His early poetry—like that of W. H. Auden, C. Day Lewis, and Louis MacNeice, with whom he became associated at Oxford—was inspi...