1 文書を見つけるための辞書。

• atomic number 8, o, oxygen
• 酸素, O
• 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
• 2価の非金属元素で、通例無色、無臭、無味の不燃性の二原子気体