atomic number 8

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas;
constitutes 21 percent of the atmosphere by volume;
the most abundant element in the earth's crust
• Syn:
oxygen, O
• Derivationally related forms:
oxygenate (for: oxygen), oxygenize (for: oxygen)
• Hypernyms:
chemical element, element, gas
• Hyponyms:
liquid oxygen, LOX
• Substance Holonyms:
water, H2O, air, ozone