protoxide

American  

[proh-tok-sahyd, -sid] / proʊˈtɒk saɪd, -sɪd /

Also protoxid

noun

Chemistry.

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

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protoxide British  

/ prəʊˈtɒksaɪd /

noun

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

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Etymology

Origin of protoxide

prot- + oxide

Example Sentences

There are two oxides of iron: one, the protoxide, which imparts a green colour to glass; and the other the peroxide, whose staining property is yellow.

From Project Gutenberg

The chemical action in the two cases is different: the black oxide of manganese is what is termed an oxidizing agent, and gives up, at a high temperature, a portion of its oxygen to the protoxide of iron, thereby converting it into the peroxide.

From Project Gutenberg

Arsenious acid also acts as an oxidizing agent, in that it gives up its oxygen to the protoxide of iron, converting it into the peroxide; but the arsenic itself, which has lost its oxygen, is reduced to the metallic state, and being volatile, does not remain with the glass, but passes off by the flues of the furnace.

From Project Gutenberg

Oxide of iron colours glass either green or yellow, according to the nature of the oxide; the silicate of the protoxide of iron being green, and that of the peroxide, yellow of a slightly brownish tint.

From Project Gutenberg

Copper forms two oxides, the suboxide and the protoxide; the suboxide colours glass red, while the protoxide renders it green.

From Project Gutenberg