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pumice

(Encyclopedia)pumice pŭmˈĭs [key], volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the g...

Georgian architecture

(Encyclopedia)Georgian architecture. It includes several trends in English architecture that were predominant during the reigns (1714–1830) of George I, George II, George III, and George IV. The first half of the...

weaverbird

(Encyclopedia)weaverbird, name for the Ploceidae, a family of Old World seed-eating birds closely resembling finches (hence the alternate name weaver finch). It includes a number of so-called goldfinches and waxbil...

Spark, Dame Muriel

(Encyclopedia)Spark, Dame Muriel, 1918–2006, Scottish novelist, b. Muriel Sarah Camberg. She lived in Edinburgh, Rhodesia (now Zimbabwe), London, New York, and Rome, and spent her last years in Tuscany. Spark's t...

Mitla

(Encyclopedia)Mitla mētˈlä [key] [Nahuatl,=abode of the dead], religious center of the Zapotec, near Oaxaca, SW Mexico. Probably built in the 13th cent., the buildings, unlike the pyramidal structures of most Mi...

vertebrate

(Encyclopedia)vertebrate, any animal having a backbone or spinal column. Verbrates can be traced back to the Silurian period. In the adults of nearly all forms the backbone consists of a series of vertebrae. All ve...

particle detector

(Encyclopedia)CE5 Particle detector—Bubble chamber: A. Pressure drops as piston is raised; B. Charged particles passing through chamber ionize atoms in liquid; C. Bubbles form around atoms and form visible tra...

catacombs

(Encyclopedia)catacombs katˈəkōmz [key], cemeteries of the early Christians and contemporary Jews, arranged in extensive subterranean vaults and galleries. Besides serving as places of burial, the catacombs were...

mountain beaver

(Encyclopedia)mountain beaver, stout, short-limbed North American rodent, Aplodontia rufa, not closely related to the true beaver. Also called sewellel beaver after the Chinook word for a robe made from its pelts, ...

audiencia

(Encyclopedia)audiencia oudyānˈsyä [key], royal court of justice in Spain and the Spanish Empire, varying greatly in its form and function but having some administrative as well as judicial capacity. Use of the ...