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).
protoxide of nitrogen, laughing gas, now called hyponitrous oxide. See under Laughing.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.