titanium

titanium
[tʌɪˈteɪnɪəm, tɪ-]
noun

[mass noun]the chemical element of atomic number 22, a hard silver-grey metal of the transition series, used in strong, light, corrosion-resistant alloys(Symbol: Ti)
（化学元素）钛(符号：Ti)
One of the transition metals, titanium is a common element in the earth's crust; the main sources are the minerals ilmenite and rutile. It is used to make strong light corrosion-resistant alloys. Very large quantities of the dioxide are manufactured for use as a white pigment in paper, paint, etc

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