rubidium.
The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
Meaning & usage
The chemical element (symbol Rb) with an atomic number of 37. It is a soft, highly reactive alkali metal.
A single atom of this element.
Where this word comes from
A New Latin word derived by German chemist R. W. Bunsen in 1861, from Latin rūbidus (“red”) because its spectrum has two red lines.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.