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opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

Frisch, Karl von

(Encyclopedia)Frisch, Karl von frĭsh [key], 1887–1982, Austrian zoologist, b. Vienna, Austria. He studied zoology with Richard von Hertwig, whom he later succeeded as professor of zoology at Munich Univ. For his...

tall tale

(Encyclopedia)tall tale, extravagantly and humorously exaggerated story of the backwoods exploits of an American frontiersman. Originating in the 1820s, the genre remained popular well into the 20th cent. One of th...

silver chloride

(Encyclopedia)silver chloride, chemical compound, AgCl, a white cubic crystalline solid. It is nearly insoluble in water but is soluble in a water solution of ammonia, potassium cyanide, or sodium thiosulfate (“h...

slate

(Encyclopedia)slate, fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this characteristically regular and pl...

Spotswood, Alexander

(Encyclopedia)Spotswood, Alexander, 1676–1740, colonial governor of Virginia, b. Tangier, Morocco. Appointed in 1710, he was officially lieutenant governor under the nominal governorship of George Hamilton, 1st e...

Waters, Ethel

(Encyclopedia)Waters, Ethel, 1896?–1977, African-American singer and actress, b. Chester, Pa. As a singer, she is noted for her sultry, sophisticated, and dramatic version of the blues, evinced in her interpretat...

Cardigan Welsh corgi

(Encyclopedia)Cardigan Welsh corgi, breed of short, long-bodied working dog believed to have been introduced into Wales from Central Europe c.1200 b.c. It stands about 12 in. (30.5 cm) high at the shoulder and weig...

Ahmed I

(Encyclopedia)Ahmed I äˈmĕd [key], 1589–1617, Ottoman sultan (1603–17), son and successor of Muhammad III to the throne of the Ottoman Empire. The chief event of his reign was the Treaty of Zsitvatorok (1606...

Aiken, Conrad

(Encyclopedia)Aiken, Conrad āˈkĭn [key], 1889–1973, American author, b. Savannah, Ga., grad. Harvard, 1912. Aiken is best known for his poetry, which often is preoccupied with the sound and structure of music;...