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From The Collaborative International Dictionary of English v.0.48:
Tungsten \Tung"sten\ (t[u^]ng"st[e^]n), n. [Sw. tungsten (cf. Dan. tungsteen, G. tungstein); tung heavy (akin to Dan. tung, Icel. [thorn]ungr) + sten stone. See Stone.] 1. (Chem.) A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18. [1913 Webster] 2. (Min.) Scheelite, or calcium tungstate. [Obs.] [1913 Webster] Tungsten ocher, or Tungstic ocher (Min.), tungstite. [1913 Webster]