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specific gravity

(Encyclopedia)specific gravity, ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the t...

Byzantine music

(Encyclopedia)Byzantine music, the music of the Byzantine Empire composed to Greek texts as ceremonial, festival, or church music. Long thought to be only a further development of ancient Greek music, Byzantine mus...

Shinto

(Encyclopedia)Shinto shĭnˈtō [key], ancient native religion of Japan still practiced in a form modified by the influence of Buddhism and Confucianism. In its present form Shinto is characterized less by religiou...

Ferdinand II, king of Aragón

(Encyclopedia)Ferdinand II or Ferdinand the Catholic, 1452–1516, king of Aragón (1479–1516), king of Castile and León (as Ferdinand V, 1474–1504), king of Sicily (1468–1516), and king of Naples (1504–16...

polarization of light

(Encyclopedia)polarization of light, orientation of the vibration pattern of light waves in a singular plane. Unpolarized light can be converted into a single polarized beam by means of the Nicol prism, a device ...

radar

(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...

Pan-Arabism

(Encyclopedia)Pan-Arabism, general term for the modern movement for political unification among the Arab nations of the Middle East. Since the Ottoman Turks rose to power in the 14th cent., there have been stirring...

Brown, John, American abolitionist

(Encyclopedia)Brown, John, 1800–1859, American abolitionist, b. Torrington, Conn. He spent his boyhood in Ohio. Before he became prominent in the 1850s, his life ha...

balance

(Encyclopedia)balance, instrument used in laboratories and pharmacies to measure the mass or weight of a body. A balance functions by measuring the force of gravity that the earth exerts on an object, i.e., its wei...

ecumenical movement

(Encyclopedia)ecumenical movement ĕkˌyo͞omĕnˈĭkəl, ĕkˌyə– [key], name given to the movement aimed at the unification of the Protestant churches of the world and ultimately of all Christians. During and ...