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POS
HYPHEN
CIDE DICTIONARY

protoxide

RELATED WORD :

 : 
Noun
 : 
pro=tox=ide

CIDE DICTIONARY

protoxiden. [Proto- + oxide: cf. F. protoxide.].
     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<--, used as an anaesthetic in dentistry; now (1950-1996) called nitrous oxide, NO -->. See under Laughing.

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