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1. (n.) rubidium
a silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; at. wt.: 85.47; at. no.: 37; sp. gr.: 1.53 at 20°C.
Etymology: (< G (1861), = L rūbid(us) red (in allusion to the two red lines in its spectrum) +-ium -ium2)
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| Definition of 'Rubidium' |
Princeton's WordNet |
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1. (noun) rubidium, Rb, atomic number 37
a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
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| Definition of 'Rubidium' |
Webster Dictionary |
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1. (noun) Rubidium
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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| Definition of 'Rubidium' |
U.S. National Library of Medicine |
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1. Rubidium
An element that is an alkali metal. It has an atomic symbol Rb, atomic number 37, and atomic weight 85.47. It is used as a chemical reagent and in the manufacture of photoelectric cells.
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Definitions of Rubidium 
