RUBIDIUMS

Noun

rubidiums

plural of rubidium

Source: Wiktionary

RUBIDIUM

Ru*bid"i*um, n. Etym: [NL., fr. L. rubidus red, fr. rubere to be red. So called from two dark red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia. See Rubicund.] (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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