a steel-gray, ductile metallic element of the rare-earth group found only in combination. Symbol: Ce; atomic weight: 140.12; atomic number: 58.
a malleable ductile steel-grey element of the lanthanide series of metals, used in lighter flints and as a reducing agent in metallurgy. Symbol: Ce; atomic no: 58; atomic wt: 140.115; valency: 3 or 4; relative density: 6.770; melting pt: 798°C; boiling pt: 3443°C
element, first isolated in pure form in 1875, named for ceria, the name of the earth from which it was taken, which was discovered in 1803 and named by Berzelius and Hissinger for Ceres, the minor planet, which had been discovered in 1801 and named for the Roman goddess Ceres.
cerium ce·ri·um (sēr’ē-əm)
A lustrous, malleable metallic rare-earth element that occurs chiefly in the minerals monazite and bastnaesite, exists in four allotropic states, and is used in lighter flint alloys. Atomic number 58; atomic weight 140.12; melting point 799°C; boiling point 3,424°C; specific gravity 6.67; valence 3, 4.
A shiny, gray metallic element of the lanthanide series. It is ductile and malleable and is used in electronic components, alloys, and lighter flints. It is also used in glass polishing and as a catalyst in self-cleaning ovens. Atomic number 58; atomic weight 140.12; melting point 795°C; boiling point 3,468°C; specific gravity 6.67 to 8.23; valence 3, 4. See Periodic Table.
noun trademark (US & Canadian) a type of plastic binding used in strips to curl through the perforations in separate sheets of paper to bind them together
a durable, heat-resistant alloy formed by compacting and sintering a metal and a ceramic substance, used under conditions of high temperature and stress. noun any of several materials consisting of a metal matrix with ceramic particles disseminated through it. They are hard and resistant to high temperatures Also called ceramal
European Laboratory for Particle Physics; formerly called European Organization for Nuclear Research: an international research organization based in Geneva, Switzerland. Contemporary Examples noun acronym Conseil Européen pour la Recherche Nucléaire; an organization of European states with a centre in Geneva for research in high-energy particle physics, now called the European Laboratory for Particle Physics An […]
Eugene Andrew, born 1934, U.S. astronaut.