PROTOXIDE

Etymology

Noun

protoxide (plural protoxides)

(inorganic chemistry) Any of a series of oxides of a particular metal that has the fewest atoms of oxygen per molecule

Source: Wiktionary

Pro*tox"ide, n. Etym: [Proto- + oxide: cf. F. protoxide.] (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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