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De Soto, Hernando

(Encyclopedia)De Soto, Hernando dĭsōˈtō, Span. ĕrnänˈdō dā sōˈtō [key], c.1500–1542, Spanish explorer. After serving under Pedro Arias de Ávila in Central America and under Francisco Pizarro in Peru,...

rubidium

(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...

Tuva Republic

(Encyclopedia)Tuva Republic or Tyva Republic both: to͞oˈvə, Rus. to͞oväˈ, Tuvan to͞owäˈ [key], constituent republic (1990 est. pop. 366,000), 65,830 sq mi (170,500 sq km), extreme S Siberian Russia, on the...

Williams, Venus Ebone Starr

(Encyclopedia)Williams, Venus Ebone Starr, 1980–, b. Lynwood, Calif., and Serena Jameka Williams, 1981–, b. Saginaw, Mich., African-American tennis players. Coached by their father, Richard, both sisters turned...

Sonora

(Encyclopedia)Sonora sōnōˈrä [key], state (1990 pop. 1,823,606), 70,484 sq mi (182,554 sq km), NW Mexico, on the Gulf of California, S of Arizona. Hermosillo is the capital. Sonora is mostly mountainous, with v...

blindness

(Encyclopedia)blindness, partial or complete loss of sight. Blindness may be caused by injury, by lesions of the brain or optic nerve, by disease of the cornea or retina, by pathological changes originating in syst...

mirror

(Encyclopedia)mirror, in optics, a reflecting surface that forms an image of an object when light rays coming from that object fall upon it (see reflection). Usually mirrors are made of plate glass, one side of whi...

fur

(Encyclopedia)fur, hairy covering of an animal, especially the skins of animals that have thick, soft, close-growing hair next to the skin itself and coarser protective hair above it. The underhair is frequently ca...

Ossetia

(Encyclopedia)Ossetia älänˈyä [key], Ossetian Iryston, region of the central Caucasus, divided between the Republic of Georgia and the Russian Federation. On the northern slope is North Ossetia-Alania (1990 est...

Helena

(Encyclopedia)Helena. 1 City (2020 pop. 20,633), Jefferson and Shelby cos., central Ala.; inc. 1877. White settlers began to occupy the area after the War of ...