English noun: rubidium | |||
1. | rubidium (substance) 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 | atomic number 37, Rb | ||
Broader (hypernym) | metal, metallic element | ||
Substance meronym | carnallite, lepidolite, pollucite | ||