protoxide
n. மிகக் குறைந்த அளவான உயிரகங் கொண்ட சேர்மவகை.
Pro*tox"ide, n. Etym: [Proto- + oxide: cf. F. protoxide.] (Chem.) Defn: 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 oxideNO. See under Laughing.