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Noun: rubidium  roo'bi-dee-um
  1. A soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
    - Rb, atomic number 37

Derived forms: rubidiums

Type of: metal, metallic element

Part of: carnallite, lepidolite, pollucite

Encyclopedia: Rubidium