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tobogganing

(Encyclopedia)tobogganing, sport of coasting down snowy hillsides or chutes on a toboggan, a flat-bottomed vehicle made of hard wood. The toboggan, typically measuring 1.5 ft by 6–8 ft (.46 m by 1.8–2.4 m), is ...

Reuter, Fritz

(Encyclopedia)Reuter, Fritz (Heinrich Ludwig Christian Friedrich Reuter) , hīnˈrĭkh lo͞otˈvĭkh krĭsˈtyän frēˈdrĭkh [key], 1810–74, German writer. His tales of Mecklenburg life are among the best of Ge...

Semenza, Gregg Leonard

(Encyclopedia)Semenza, Gregg Leonard, 1956–, American oncologist and molecular biologist, b. New York City, Ph.D. Univ. of Pennsylvania, 1984. Semenza has spent his entire career at the Johns Hopkins School of Me...

Croker, Richard

(Encyclopedia)Croker, Richard, 1841–1922, American politician, head of Tammany Hall from 1886 to 1902, b. Co. Cork, Ireland. He became prominent as Democratic leader of New York City's East Side and as an aide of...

cross-laminated timber

(Encyclopedia)cross-laminated timber (CLT), manufactured wood panels that consist of layers of boards glued together under pressure with the grain of the boards in one layer running perpendicular to the grain in ad...

chickenpox

(Encyclopedia)chickenpox or varicella vârˌəsĕlˈə [key], infectious disease usually occurring in childhood. It is caused by the same herpesvirus, varicella-zoster, that produces shingles; the virus can hide in...

climbing perch

(Encyclopedia)climbing perch, climbing gourami, or walking fish, any of several fish of the family Anabantidae, adapted to living in oxygen-depleted water or on dry land. They are not related to the true perch. Th...

alkali metals

(Encyclopedia)alkali metals, metals found in Group 1 of the periodic table. Compared to other metals they are soft and have low melting points and densities. Alkali metals are powerful reducing agents and form univ...

fetal alcohol syndrome

(Encyclopedia)fetal alcohol syndrome (FAS), pattern of physical, developmental, and psychological abnormalities seen in babies born to mothers who consumed alcohol during pregnancy. The abnormalities include low bi...

altimeter

(Encyclopedia)altimeter ăltĭmˈĭtər, ălˈtĭmēˌtər [key], device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear e...