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xylophone

(Encyclopedia)CE5 Xylophone xylophone zīˈləfōn [key] [Gr.,=wood sound], musical instrument having graduated wooden slabs that are struck by the player with small, hard mallets. The slabs are usually arrange...

scar

(Encyclopedia)scar, fibrous connective tissue that forms at the site of injury or disease in any tissue of the body. Scar tissue may replace injured skin and underlying muscle, damaged heart muscle, or diseased are...

Sefid Rud

(Encyclopedia)Sefid Rud sä– [key], river, c.450 mi (720 km) long, rising in NW Iran and flowing generally east to meet the Caspian Sea at Rasht. A storage dam on the river was completed in 1962. The Sefid Rud ha...

Revillagigedo Islands

(Encyclopedia)Revillagigedo Islands or Revillagigedo Archipelago rāvēˈyähēhāˈᵺō [key], volcanic island group in the Pacific Ocean, c.450 mi (720 km) W of Colima state and S of Baja California, Mexico. The...

Comanche

(Encyclopedia)Comanche kəmănˈchē [key], Native North Americans belonging to the Shoshonean group of the Uto-Aztecan branch of the Aztec-Tanoan linguistic stock (see Native American languages). They originated f...

hemlock

(Encyclopedia)hemlock, any tree of the genus Tsuga, coniferous evergreens of the family Pinaceae (pine family) native to North America and Asia. The common hemlock of E North America is the eastern hemlock, T. cana...

polecat

(Encyclopedia)polecat, carnivorous mammal of the weasel family. The name refers especially to the common Old World polecat, Mustela putorius, found in wooded areas of N Eurasia and N Africa. Similar to weasels, but...

ultrasonics

(Encyclopedia)ultrasonics, study and application of the energy of sound waves vibrating at frequencies greater than 20,000 cycles per second, i.e., beyond the range of human hearing. The application of sound energy...

Oregon, state, United States

(Encyclopedia)CE5 Oregon ŏrˈĭgən, –gŏn [key], state in the Pacific Northwest of the United States. It is bordered by Washington, largely across the Columbia River (N), Idaho, partially across the Snake Ri...

concretion

(Encyclopedia)concretion, mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the...