from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the oxide of a particular element (that has multiple oxides) having the smallest proportion of oxygen

from the GNU version of the Collaborative International Dictionary of English

  • n. That one of a series of oxides having the lowest proportion of oxygen. See proto-, 2 (b).


proto- +‎ oxide (Wiktionary)


  • I believe, however, that there is such an oxide; that it is often present in variable proportions in what is commonly called protoxide, throwing uncertainty upon the results of its analysis, and causing the electrolytic decomposition above described [A].

    Experimental Researches in Electricity, Volume 1

  • But in working with this oxide and the chloride, I observed facts which lead me to doubt whether the compounds usually called the protoxide and the protochloride do not often contain other compounds, consisting of single proportions, which are the true proto compounds, and which, in the case of the oxide, might give rise to the decomposition above described.

    Experimental Researches in Electricity, Volume 1

  • The aurates were easily produced, but it was impossible to obtain the combination of alkalis and the protoxide of gold.

    The International Monthly, Volume 3, No. 1, April, 1851

  • The most important is the effect of the decay of vegetable matter, without access of air, which is attended by the reduction of the peroxide of iron to the state of protoxide, and not unfrequently by the production of sulphuret of iron, compounds which are extremely prejudicial to vegetation, and occasionally give rise to some difficulties when the subsoil is brought to the surface, as we shall afterwards have to notice.

    Elements of Agricultural Chemistry

  • In these minerals alkalies are entirely absent, and their decomposition is due to the presence of protoxide of iron, which readily absorbs oxygen from the air, when the magnesia is separated and a ferruginous clay left.

    Elements of Agricultural Chemistry

  • The subsoil contains also a large quantity of protoxide of iron, a substance frequently found in subsoils containing much organic matter, and to which the air has imperfect access.

    Elements of Agricultural Chemistry

  • Reference has been already made to the bad effects of protoxide of iron, and it would appear that organic matter is sometimes injurious.

    Elements of Agricultural Chemistry

  • To make the process practicable, it was only necessary to find sufficiently powerful refrigerants; and these were looked for among gases that had proved more refractory than carbonic acid and protoxide of nitrogen.

    Scientific American Supplement, No. 470, January 3, 1885

  • Sir John Herschel then proceeds to show that whatever be the state of the iron in the double salts in question, its reduction by blue light to the state of protoxide is indicated by many other agents.

    Photographic Reproduction Processes

  • When all the non-decomposed oxalate is washed from the proof, a feeble image of oxalate of protoxide of iron, scarcely visible, is left on the paper.

    Photographic Reproduction Processes


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