Found 2 items, similar to Hafnium.
English → English (WordNet) Definition: hafnium hafnium n : a gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons [syn: Hf, atomic number 72]
English → English (gcide) Definition: hafnium hafnium \haf"ni*um\ (h[a^]f"n[=e]*[u^]m or h[aum]f"n[=e]*[u^]m), n. A metallic element of atomic number 72 present together with zirconium to the extent of 1% to 5% in zirconium minerals. It is a poisonous, ductile metal with a brilliant silver luster, has an atomic weight of 178.49, and has a high melting point (2227[deg] C). It is used in nuclear reactors, and incandescent lamps as a scavenger of oxygen and nitrogen. See also norium. [1913 Webster]