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 nitric oxide 名詞
 氧化亞氮,笑氣

 Ni·tric a.  Chem. Of, pertaining to, or containing, nitrogen; specifically, designating any one of those compounds in which, as contrasted with nitrous compounds, the element has a higher valence; as, nitric oxide; nitric acid.
 Nitric acid, a colorless or yellowish liquid obtained by distilling a nitrate with sulphuric acid.  It is powerfully corrosive, being a strong acid, and in decomposition a strong oxidizer.
 Nitric anhydride, a white crystalline oxide of nitrogen (N2O5), called nitric pentoxide, and regarded as the anhydride of nitric acid.
 Nitric oxide, a colorless poisous gas (NO) obtained by treating nitric acid with copper.  On contact with the air or with oxygen, it becomes reddish brown from the formation of nitrogen dioxide (NO2, also called nitric dioxide or nitric peroxide).
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 nitric oxide
      n : a poisonous red-brown gas (NO)