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deuterium

(Encyclopedia) deuteriumdeuteriumd&oomacr;tērˈēəm [key], isotope of hydrogen with mass no. 2. The deuterium nucleus, called a deuteron, contains one proton and one neutron. Deuterium is also…

Urey, Harold Clayton

(Encyclopedia) Urey, Harold ClaytonUrey, Harold Claytony&oobreve;rˈē [key], 1893–1981, American chemist, b. Walkerton, Ind., grad. Univ. of Montana (B.S., 1917), Ph.D. Univ. of California, 1923.…

cassiterite

(Encyclopedia) cassiteritecassiteritekəsĭtˈərīt [key], heavy, brown-to-black mineral, tin oxide, SnO2, crystallizing in the tetragonal system. It is found as short prismatic crystals and as irregular…

Charleville-Mézières

(Encyclopedia) Charleville-Mézières Charleville-Mézières shärləvēlˈ-māzyĕrˈ [key], town, capital of Ardennes dept., NE…

horseshoe

(Encyclopedia) horseshoe, narrow plate, commonly of iron or steel, shaped to fit a horse's hoof and attached to the hoof by nailing it to the inner edge of the horny wall of the hoof. Horseshoes vary…