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cryptosporidium

(Encyclopedia)cryptosporidium krĭpˌtōspərĭdˈēəm [key], genus of protozoans having at least four species; they are waterborne parasites that cause the disease cryptosporidiosis. One of the species appears to...

inspector general

(Encyclopedia)inspector general, a government official tasked with independently overseeing an agency or department. Inspectors general are utilized by many countries, as well as regional and local governments and ...

Vernon, cities, United States

(Encyclopedia)Vernon. 1 City (1990 pop. 152), Los Angeles co., S Calif., industrial suburb 2 mi (3.2 km) S of downtown Los Angeles; founded and inc. 1905. Vernon has a workforce (c.44,000) that hugely exceeds its f...

expansion

(Encyclopedia)expansion, in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between...

screw

(Encyclopedia)screw, simple machine consisting essentially of a solid cylinder, usually of metal, around which an inclined plane winds spirally, either clockwise or counterclockwise. It is used to fasten one object...

Etna

(Encyclopedia)Etna or Aetna both: ĕtˈnə [key], volcano, 10,958 ft (3,340 m) high, on the east coast of Sicily, S Italy. One of the most active volcanoes in the world, it also is the highest active volcano in Eur...

appendix

(Encyclopedia)appendix, small, worm-shaped blind tube, about 3 in. (7.6 cm) long and 1⁄4 in. to 1 in. (.64–2.54 cm) thick, projecting from the cecum (part of the large intestine) on the right side of the lower ...

boiler

(Encyclopedia)boiler, device for generating steam. It consists of two principal parts: the furnace, which provides heat, usually by burning a fuel, and the boiler proper, a device in which the heat changes water in...

Pétion, Alexandre

(Encyclopedia)Pétion, Alexandre älĕksäNˈdrə pātyôNˈ [key], 1770–1818, Haitian revolutionist. After taking part in the expulsion (1798) of the English from Haiti, he joined (1799) André Rigaud against To...

alloy

(Encyclopedia)alloy ălˈoi, əloiˈ [key] [O. Fr.,=combine], substance with metallic properties that consists of a metal fused with one or more metals or nonmetals. Alloys may be a homogeneous solid solution, a he...