Protoxide

Pro*tox"ide

(?), n. [Proto- + oxide: cf. F. protoxide.] (Chem.) That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
[1913 Webster]

protoxide of nitrogen, laughing gas, now called hyponitrous oxide. See under Laughing.
[1913 Webster]

 

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Tue 11th December 2018