Definify.com

Webster 1913 Edition

Protoxide

Pro-tox′ide

,

Noun.

[

Proto-

+

oxide

: cf. F.

protoxide

.]

(Chem.)

That one of a series of oxides having the lowest proportion of oxygen. See

, 2

(b)

.

protoxide of nitrogen

,

laughing gas, now called

hyponitrous oxide

. See under

.