- A lustrous silver-white metallic element whose atomic number is 69. It is soft, malleable, and ductile, and has about 35 known isotopes, of which one is stable. It is used, for instance, as an X-ray source, and in arc lamps. Its chemical symbol is Tm.
- chemical symbolTm
Information & Library Science
- abbreviation in Internet addresses, the top-level domain for Turkmenistan