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Dictionary

ru•bid•i•um

Pronunciation: (rOO-bid'ē-um), [key]
—n. Chem.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

rubicund

rubidium-strontium dating

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