Hypertext Webster Gateway: "rubidium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Rubidium \Ru*bid"i*um\, n. [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.)
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.
From WordNet (r) 1.7 (wn)
rubidium
n : 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 [syn: {Rb}, {atomic
number 37}]
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