a silver-white chemical element, one of the rare-earth elements, with a great capacity to absorb neutrons and with strong magnetic properties, esp. at very low temperatures: symbol, Dy; at. no., 66
See dysprosium in American Heritage Dictionary 4
(dĭs-prōˈzē-əm, -zhē-əm)
noun Symbol Dy
A soft, silvery rare-earth element used in nuclear research. Atomic number 66; atomic weight 162.50; melting point 1,407°C; boiling point 2,600°C; specific gravity 8.536; valence 3. See Table at element.