Pronunciation: (tung'stun),[key] —n.Chem. a rare, metallic element having a bright-gray color, a metallic luster, and a high melting point, 3410° C, and found in wolframite, tungstite, and other minerals: used in alloys of high-speed cutting tools, electric-lamp filaments, etc. Symbol: W; at. wt.: 183.85; at. no.: 74; sp. gr.: 19.3. Also called wolfram.