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 ]
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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