- noun a naturally radioactive element
- A radioactive metallic chemical element with atomic number 87. It is very rare, and is the most electropositive element. It is also the most reactive of the naturally occurring elements, and has about 30 known isotopes, all unstable. Used in laser trapping studies. Its chemical symbol is Fr.
- chemical symbolFr
Information & Library Science
- abbreviation in Internet addresses, the top-level domain for France