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Hazleton

(Encyclopedia)Hazleton hāˈzəltən [key], city (2020 pop. 29,963), Luzerne co., E Pa., on a mountain top in ...

(Encyclopedia)Peru pəro͞oˈ [key], city (1990 pop. 12,843), seat of Miami co., N Ind., on the Wabash River; inc. 1847. It is a trade, processing, and rail center for a fertile agricultural area. Among its product...

Baekeland, Leo Hendrik

(Encyclopedia)Baekeland, Leo Hendrik bākˈlănd [key], 1863–1944, American chemist, b. Belgium, grad. Univ. of Ghent, 1882. In 1889 he emigrated to the United States. He founded (1893) and conducted, until 1899,...

Henderson

(Encyclopedia)Henderson. 1 City (2020 pop. 27,801), seat of Henderson co., NW Ky., on the Ohio River, in an oil, coal, tobacco, corn, and livestock area; founded ...

pen

(Encyclopedia)pen, pointed implement used in writing or drawing to apply ink or a similar colored fluid to any surface, such as paper. Various kinds of pens have been used since ancient times. Reeds that were slit ...

shield, armor

(Encyclopedia)shield, piece of defensive armor, worn on the arm or shoulder to ward off weapons during combat, used prior to the dominance of gunpowder. Originally for individual defense during hand-to-hand combat,...

epoxy resins

(Encyclopedia)epoxy resins, group of synthetic resins used to make plastics and adhesives. These materials are noted for their versatility, but their relatively high cost has limited their use. High resistance to c...

polyolefins

(Encyclopedia)polyolefins pŏlˌēōlˈəfən [key], group of plastics that are polymers of various alkenes, or olefins. The most important are polyethylene and polypropylene. ...

Hoorn

(Encyclopedia)Hoorn, city, North Holland prov., N central Netherlands, on an inlet of the Markermeer. It is a commercial and processing center for a vegetable-growing...

drainage, in agriculture

(Encyclopedia)drainage, in agriculture, the removal of excess water from the soil, either by a system of surface ditches, or by underground conduits if required by soil conditions and land contour. Diesel or centri...