tung ‧ sten /ˈtʌŋstən/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: Swedish ; Origin: tung 'heavy' + sten 'stone' ]
a hard metal that is used to make steel and in the thin wires in electric light ↑ bulb s . It is a chemical ↑ element : symbol W