1. rubidium

noun. 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.
Synonyms
lepidolite metal carnallite atomic number 37 Rb pollucite metallic element
Antonyms
nonmetallic
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2. rubidium-strontium dating

noun. Geological dating based on the proportions of radioactive rubidium into its decay product strontium; radioactive rubidium has a half-life of 47,000,000,000 years.
Synonyms
geological dating dating
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