01 n. That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).
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1.
That one of a series of oxides having the lowest proportion of oxygen. See Proto-, 2 (b).(Chem.) See: Proto-
Phrases & compounds
protoxide of nitrogen —
laughing gas, now called hyponitrous oxide<--, used as an anaesthetic in dentistry; now (1950-1996) called nitrous oxide, NO -->. See under Laughing.