Rb

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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, atomic number 37
• Hypernyms:
metallic element, metal
• Substance Holonyms:
carnallite, lepidolite, pollucite