The word titanium is a noun. Titanium means (1) a light strong gray lustrous corrosion-resistant metallic element used in strong light-weight alloys (as for airplane parts); the main sources are rutile and ilmenite.
The following articles and web pages elaborate on the word titanium.
Titanium is a durable precious metal that has been used in fine jewelry since the 1980s. Titanium is lightweight, hypo-allergenic, and non-tarnishing; it is often used for wedding rings.
This dentist directory includes information about prosthodontics dentists in the United States of America. The photo on this page shows a plastic dental model, with a titanium dental implant and a molar tooth.