คำว่า ' tungsten ' ( N )
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คำนิยามในภาษาอังกฤษ (definition) :
[n.] 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.
[n.] Scheelite, or calcium tungstate.