hafnium
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haf·ni·um
(hăf′nē-əm)n. Symbol Hf
A brilliant, silvery, metallic element separated from ores of zirconium and used in nuclear reactor control rods, as a getter for oxygen and nitrogen, and in tungsten filament alloys. Atomic number 72; atomic weight 178.49; melting point 2,233°C; boiling point 4,603°C; specific gravity 13.31; valence 4. See Periodic Table.
[After Hafnia, Medieval Latin name for Copenhagen, Denmark.]
hafnium
(ˈhæfnɪəm)n
(Elements & Compounds) a bright metallic element found in zirconium ores: used in tungsten filaments and as a neutron absorber in nuclear reactors. Symbol: Hf; atomic no: 72; atomic wt: 178.49; valency: 4; relative density: 13.31; melting pt: 2231±20°C; boiling pt: 4603°C
[C20: New Latin, named after Hafnia, Latin name of Copenhagen + -ium]
haf•ni•um
(ˈhæf ni əm, ˈhɑf-)n.
a toxic metallic element found in most zirconium minerals. Symbol: Hf; at. wt.: 178.49; at. no.: 72; sp. gr.: 12.1.
[1923; < New Latin Hafn(ia) Copenhagen + -ium2]
haf·ni·um
(hăf′nē-əm) Symbol Hf A bright, silvery metallic element that occurs in zirconium ores. Because hafnium absorbs neutrons better than any other metal and is resistant to corrosion, it is used to control nuclear reactions. Atomic number 72. See Periodic Table.
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| Noun | 1. |  hafnium - a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electronsmetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |