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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
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Recent Examples of rubidium from the Web
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Image: Individual rubidium atoms form into a single super-atom in a Bose-Einstein condensate.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rubidium'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of rubidium
New Latin, from Latin rubidus red, from rubēre
Medical Dictionary
rubidium
playMedical Definition of rubidium
: a soft silvery metallic element that decomposes water with violence and bursts into flame spontaneously in air—symbol Rb; see element table
Learn More about rubidium
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See words that rhyme with rubidium Britannica.com: Encyclopedia article about rubidium
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