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protoxide

N ออกไซด์ ที่ มี ออกซิเจน น้อยที่สุด 

 

Webster's 1913 Dictionary

PROTOXIDE

Pro *tox "ide, n. Etym: [Proto- + oxide: cf. F. protoxide. ] (Chem. )

 

Defn: That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b ). protoxide of nitrogen, laughing gas, now called hyponitrous oxideNO. See under Laughing.