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n. Symbol Dy
A soft, silvery metallic element of the lanthanide series occurring in the minerals monazite and bastnaesite, used in nuclear reactor control rods and in the manufacture of laser materials and compact discs. Atomic number 66; atomic weight 162.50; melting point 1,412°C; boiling point 2,567°C; specific gravity 8.551; valence 3. See Periodic Table.
(Elements & Compounds) 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]
dys•pro•si•um(dɪsˈproʊ si əm, -ʃi-)
a rare-earth element that is highly reactive and paramagnetic and used to absorb neutrons in nuclear reactors. Symbol: Dy; at. wt.: 162.50; at. no.: 66.
[< French (1886)]
Symbol Dy A soft, silvery metallic element of the lanthanide series. Because it has a high melting point and absorbs neutrons well, dysprosium is used to help control nuclear reactions. Atomic number 66. See Periodic Table.
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|Noun||1.||dysprosium - a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic|