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Piqua

(Encyclopedia)Piqua pĭkˈwā [key], city (1990 pop. 20,612), Miami co., W Ohio, on the Miami River; settled 1797, chartered 1929. It is an industrial city with diverse manufactures, including airplane and automobi...

Wright, Russel

(Encyclopedia)Wright, Russel, 1905–76, American industrial designer, b. Lebanon, Ohio. Wright was notable for introducing modern functional forms, simplified shapes, and cheerful colors in furniture, appliances, ...

alumina

(Encyclopedia)alumina əlo͞oˈmĭnə [key] or aluminum oxide, Al2O3, chemical compound with m.p. about 2,000℃ and sp. gr. about 4.0. It is insoluble in water and organic liquids and very slightly soluble in stro...

lapis lazuli

(Encyclopedia)lapis lazuli lăpˈĭs lăzˈo͝olē [key], gem, deep blue, violet, or greenish blue in color and usually flecked with yellow iron pyrites. It is composed of lazurite, a complex sodium aluminum silica...

ruby

(Encyclopedia)ruby, precious stone, the transparent red variety of corundum, found chiefly in Myanmar, Thailand, and Sri Lanka and classified among the most valuable of gems. The Myanmarese stones are blood red, th...

Douglas, cities, United States

(Encyclopedia)Douglas. 1 City (2020 pop. 16,534), Cochise co., SE Ariz., at the Mexican border; inc. 1905. The mining and smelting of copper have been ...

Tamworth

(Encyclopedia)Tamworth, city (1991 pop. 63,260) and district, Staffordshire, W central England. Its products include clothing, textiles, and aluminum ware. An amusement park and zoo are nearby. Tamworth was burned ...

tanzanite

(Encyclopedia)tanzanite tănzănˈīt [key], beautiful gemstone discovered in 1967 in the Umba Valley near the Usambara Mts. in Tanzania, a precious variety of the mineral zoisite, a calcium aluminum silicate. Zois...

Penetanguishene

(Encyclopedia)Penetanguishene pĕnˌətăngˌgəshēnˈ, –gwəshēnˈ [key], town (1991 pop. 6,643), S Ont., Canada, on Penetanguishene Bay, an inlet of Georgian Bay. The name is a Native American word for “whi...

platform tennis

(Encyclopedia)platform tennis, version of lawn tennis played on an elevated wooden or aluminum court that is one fourth the size of a standard court, usually by doubles teams. Unlike lawn tennis, platform tennis al...