Rubidium Definition

A soft, silvery-white, metallic chemical element, one of the alkali metals, that ignites spontaneously in air and reacts violently in water: used in photocells and in filaments of vacuum tubes: symbol, Rb; at. no. 37
Webster's New World
  • atomic number 37
  • rb

Origin of Rubidium

  • A New Latin word derived by German chemist R. W. Bunsen in 1861, from Latin rubidus (“red") because its spectrum has two red lines.

    From Wiktionary

  • From Latin rūbidus red reudh- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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