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shock wave

(Encyclopedia)shock wave, wave formed of a zone of extremely high pressure within a fluid, especially the atmosphere, that propagates through the fluid at a speed in excess of the speed of sound. A shock wave is ca...

Rodchenko, Aleksandr

(Encyclopedia)Rodchenko, Aleksandr. 1891–1956, Russian painter, sculptor, photographer, and designer, b. St. Petersburg. One of the most important and versatile avant-garde artists to emerge after the Russian Rev...

Elgin, city, United States

(Encyclopedia)Elgin ĕlˈjĭn [key]. <1> City (2020 pop. 114,797), Cook and Kane counties, NE Ill., o...

Fyne, Loch

(Encyclopedia)Fyne, Loch lŏkh fīn [key], arm of the Firth of Clyde, Argyll and Bute, W Scotland. It extends 40 mi (64 km) N and NE from the Sound of Bute. The loch has long been famous for its herring fisheries. ...

Barnard's star

(Encyclopedia)Barnard's star, star with the largest observed proper motion (rate of motion across the sky with respect to other stars); located in the constellation Ophiuchus. The star's large proper motion, 10.28�...

pentimento

(Encyclopedia)pentimento pĕnˌtəmĕnˈtō [key], painter's term for the evidence in a work that the original composition has been changed. Often the opaque pigment with which the artist covered a mistake or unwan...

onomatopoeia

(Encyclopedia)onomatopoeia ŏnˌəmătˌəpēˈə [key] [Gr.,=word-making], in language, the representation of a sound by an imitation thereof; e.g., the cat mews. Poets often convey the meaning of a verse through ...

Hell Gate

(Encyclopedia)Hell Gate, narrow channel of the East River, SE N.Y., between Wards Island and Astoria, Queens, New York City. Named Hellegat by the Dutch navigator Adriaen Block, who passed through it into Long Isla...

hearing aid

(Encyclopedia)hearing aid, device used in some forms of deafness to amplify sound before it reaches the auditory organs. Modern hearing aids are electronic. They contain a tiny receiver and a transistor amplifier, ...

Bremerton

(Encyclopedia)Bremerton brĕmˈərtən [key], city (2020 pop. 43,505), Kitsap co., NW Wash., a harbor on an arm ...