suboxide

[ suhb-ok-sahyd, -sid ]

/ sʌbˈɒk saɪd, -sɪd /

the oxide of an element that contains the smallest proportion of oxygen.

Origin of suboxide

First recorded in 1795–1805; sub- + oxide

If there is much sugar, the first drop will throw down a yellow precipitate of suboxide of copper, which becomes rapidly red.

A System of Practical Medicine By American Authors, Vol. II |Various
This color was quite superficial, and the glass itself was opaque and of a vermilion tint, attributed to suboxide of copper.

Reminiscences of Glass-making |Deming Jarves
Hence it is easy to calculate the total amount of copper which has been present as suboxide.

Cooley's Practical Receipts, Volume II |Arnold Cooley
Copper forms two oxides, the suboxide and the protoxide; the suboxide colours glass red, while the protoxide renders it green.

British Manufacturing Industries |L. Arnoux

This specimen is interesting, as showing the early use and knowledge of suboxide of copper as a stain or coloring agent for glass.

Reminiscences of Glass-making |Deming Jarves

suboxide

/ (sʌbˈɒksaɪd) /

an oxide of an element containing less oxygen than the common oxide formed by the element carbon suboxide, C 2 O 3