n a soft silvery-white metallic element of the lanthanide series: used in laser materials and as a neutron absorber in nuclear control rods. Symbol: Dy; atomic no.: 66; atomic wt.: 162.50; valency: 3; relative density: 8.551; melting pt.: 1412°C; boiling pt.: 2567°C
(C20: New Latin, from Greek dusprositos difficult to get near + -ium)
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