titanium
n. C / U B2 Upper Intermediate US //taɪˈteɪniəm// UK //taɪtˈeɪniəm// ti·ta·ni·um
n. a strong, light metal that does not rust. You see it in airplanes, sports gear, and jewelry because it is tough but easy to carry.
n. a strong, lightweight, corrosion-resistant transition metal with a high strength-to-weight ratio. Typically uncountable when referring to the material; countable when referring to isotopes or specific chemical compounds.
This watch is made of titanium.
Engineers chose titanium for the frame because it is strong yet light enough for daily wear.
The aerospace industry relies on titanium alloys for jet engine components that must withstand extreme heat and stress without adding excessive weight.
From Latin titanium.