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ruthenium

(Encyclopedia)ruthenium ro͞othēˈnēəm [key], metallic chemical element; symbol Ru; at. no. 44; at. wt. 101.07; m.p. about 2,310℃; b.p. about 3,900℃; sp. gr. 12.41 at 20℃; valence commonly +2, +3, +4, +6, ...

Jewish liturgical music

(Encyclopedia)Jewish liturgical music, the music used in the religious services of the Jews. The Bible and the Talmud record that spontaneous music making was common among the ancient Jews on all important occasion...

Boulez, Pierre

(Encyclopedia)Boulez, Pierre pyĕr bo͞olĕzˈ [key], 1925–2016, French conductor and composer of modernist classical music. He studied at the Paris Conservatory with Olivier Messiaen (1944–45) and studied twel...

Debussy, Claude Achille

(Encyclopedia)Debussy, Claude Achille klôd äshēlˈ dəbüsēˈ [key], 1862–1918, French composer, exponent of musical impressionism. He studied for 11 years at the Paris Conservatory, receiving its Grand Prix ...

chiton

(Encyclopedia)CE5 A. Dorsal view of a chiton, representative mollusk of the class Amphineura B. Internal anatomy of a chiton chiton kīˈtən [key], common name for rock-clinging marine mollusks of the class Po...

eyeglasses

(Encyclopedia)eyeglasses or spectacles, instrument or device for aiding and correcting defective sight. Eyeglasses usually consist of a pair of lenses mounted in a frame to hold them in position before the eyes. Th...

gyroscope

(Encyclopedia)CE5 Three-frame gyroscope gyroscope jīˈrəskōpˌ [key], symmetrical mass, usually a wheel, mounted so that it can spin about an axis in any direction. When spinning, the gyroscope has special p...

Kellogg-Briand Pact

(Encyclopedia)Kellogg-Briand Pact brēäNˈ [key], agreement, signed Aug. 27, 1928, condemning “recourse to war for the solution of international controversies.” It is more properly known as the Pact of Paris. ...

key, in music

(Encyclopedia)key. 1 In music, term used to indicate the scale from which the tonal material of a given composition is derived. To say, for example, that a composition is in the key of C major means that it uses as...

Scarlatti, Alessandro

(Encyclopedia)Scarlatti, Alessandro älĕs-sänˈdrō skärlätˈtē [key], 1660–1725, Italian composer. He may have studied with Carissimi in Rome, where his first opera was produced in 1679. In 1684 he went to ...