Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun rb

1 sense of rb

Sense 1
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)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

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