1. 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: rubidium, Rb, atomic number 37]
WordNet (r) 3.0 (2006):
atomic number 37
n 1: 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: rubidium,
Rb, atomic number 37]