Definition of 'rb'

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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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"rb." Definitions.net. STANDS4 LLC, 2008. 23 November. 2008. http://www.definitions.net/definition/rb