a rare, silvery-white, metallic chemical element occurring with various rare-earth elements, used to produce high-intensity light sources, etc.: symbol, Sc; at. no., 21
See scandium in American Heritage Dictionary 4
(skănˈdē-əm)
noun Symbol Sc
A silvery-white metallic element found in various rare minerals and separated as a byproduct in the processing of certain uranium ores. An artificially produced radioactive isotope is used as a tracer in studies of oil wells and pipelines. Atomic number 21; atomic weight 44.956; melting point 1,540°C; boiling point 2,850°C; specific gravity 2.99; valence 3. See Table at element.