Sr

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a soft silver-white or yellowish metallic element of the alkali metal group;
turns yellow in air;
occurs in celestite and strontianite
• Syn:
strontium, atomic number 38
• Hypernyms:
metallic element, metal
• Hyponyms:
strontium 90
• Substance Holonyms:
celestite, strontianite