protoxide

[ proh-tok-sahyd, -sid ]

/ proʊˈtɒk saɪd, -sɪd /

the one of a series of oxides having the smallest proportion of oxygen.

Also pro·tox·id

[proh-tok-sid] /proʊˈtɒk sɪd/.

Origin of protoxide

prot- + oxide

As the last, but submitting oxide of chromium for the protoxide of copper.

Cooley's Practical Receipts, Volume II |Arnold Cooley
A natural clay containing about 18% of protoxide and carbonate of iron.

Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I |Arnold Cooley
By digestion with acids, it is dissolved into salts of the protoxide.

A System of Instruction in the Practical Use of the Blowpipe |Anonymous
It consists of silica 25; protoxide of manganese 60; water 13.

A Dictionary of Arts, Manufactures and Mines |Andrew Ure

All other acids dissolve its salts to protoxide, the hydrochloric acid producing chloric gas.

A System of Instruction in the Practical Use of the Blowpipe |Anonymous

protoxide

/ (prəʊˈtɒksaɪd) /

the oxide of an element that contains the smallest amount of oxygen of any of its oxides