rubidium
ru·bid·i·um
noun \rü-ˈbi-dē-əm\Definition of RUBIDIUM
: a soft silvery metallic element of the alkali metal group that reacts violently with water and bursts into flame spontaneously in air — see element table
See Origin of RUBIDIUM
New Latin, from Latin rubidus red, from rubēre
First Known Use: 1861
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