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concrete

(Encyclopedia)concrete, structural masonry material made by mixing broken stone or gravel with sand, cement, and water and allowing the mixture to harden into a solid mass. The cement is the chemically active eleme...

urinary system

(Encyclopedia)CE5 Urinary system urinary system, group of organs of the body concerned with excretion of urine, that is, water and the waste products of metabolism. In humans, the kidneys are two small organs s...

Great Plains

(Encyclopedia)Great Plains, extensive grassland region on the continental slope of central North America. They extend from the Canadian provinces of Alberta, Saskatchewan, and Manitoba south through W central Unite...

East Prussia

(Encyclopedia)East Prussia, Ger. Ostpreussen, former province of Prussia, extreme NE Germany. The region of East Prussia has low rolling hills that are heavily wooded, and it is dotted by many lakes (especially in ...

lithography

(Encyclopedia)lithography lĭthŏgˈrəfē [key], type of planographic or surface printing. It is distinguished from letterpress (relief) printing and from intaglio printing (in which the design is cut or etched in...

beaver

(Encyclopedia)beaver, either of two large aquatic rodents, Castor fiber and Castor canadensis, known for their engineering feats. They were once widespread in N and central Eurasia except E Siberia, and in North Am...

road

(Encyclopedia)road, strip of land used for transportation. The history of roads has been related to the centralizing of populations in powerful cities, which the roads have served for military purposes and for trad...

crustacean

(Encyclopedia)CE5 Internal anatomy of a female crayfish, representative of the class Crustacea crustacean krŭstāˈshən [key], primarily aquatic arthropod of the subphylum Crustacea. Most of the 44,000 crusta...

inscription

(Encyclopedia)inscription, writing on durable material. The art is called epigraphy. Modern inscriptions are made for permanent, monumental record, as on gravestones, cornerstones, and building fronts; they are oft...

dome

(Encyclopedia)CE5 Parts of a dome dome, a roof circular or (rarely) elliptical in plan and usually hemispherical in form, placed over a circular, square, oblong, or polygonal space. Domes have been built with a...