Bible Dictionaries
Rubidium
Webster's Dictionary
(n.) A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2.
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Bibliography Information
Webster, Noah. Entry for 'Rubidium'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/r/rubidium.html. 1828.