Found 1 items, similar to hyponitrous oxide.
English → English (gcide) Definition: hyponitrous oxide 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]