Hypertext Webster Gateway: "protoxide"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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) .
{protoxide of nitrogen}, laughing gas, now called
{hyponitrous oxide}
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.