atomic number 39

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a silvery metallic element that is common in rare-earth minerals;
used in magnesium and aluminum alloys
• Syn:
yttrium, Y
• Hypernyms:
metallic element, metal
• Substance Holonyms:
gadolinite, ytterbite, fergusonite, xenotime