Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


Noun: promethium  pru'mee-thee-um
  1. A soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
    - Pm, atomic number 61

Derived forms: promethiums

Type of: metal, metallic element

Encyclopedia: Promethium