tungsten
Cross references: 1. wolfram 2. element tung.sten \'t*n(k)-st*n\ n [Sw, fr. tung heavy + sten stone] : a gray-white heavy high-melting ductile hard polyvalent metallic element that resembles chromium and molybdenum in many of its properties and is used esp. for electrical purposes and in hardening alloys (as steel)
Webster's English Dictionary