rubidium

/ruˈbɪdiəm/
IPA guide

Definitions of rubidium
  1. noun
    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
    synonyms: Rb, atomic number 37
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    type of:
    metal, metallic element
    any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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