protoxide Chem.
(prəʊˈtɒksaɪd)
[prot-, proto- 3 a.]
That compound of oxygen with another element or radical which contains the smallest proportion of oxygen, as protoxide of hydrogen, H2O = water.
Now commonly otherwise named, as potassium protoxide, K2O = potassium oxide (or monoxide); protoxide of iron, FeO = ferrous oxide.
| 1804 T. Thomson [see peroxide]. 1804 Hatchett in Phil. Trans. XCIV. 323. 1812 Sir H. Davy [see peroxide]. 1836–41 Brande Chem. (ed. 5) 609 Potassium..forms two definite compounds with oxygen, which we may call the protoxide and peroxide. 1847 Turner's Elem. Chem. (ed. 8) 190 Water (protoxide of hydrogen). 1865–8 Watts Dict. Chem. III. 808 Manganese forms four oxides of definite composition, viz. (1) Protoxide or Manganous oxide MnO... (4) Dioxide or Peroxide MnO2. The protoxide is a strong base, forming with acids a class of very stable salts. 1880 E. Cleminshaw Wurtz' Atom. Th. 61 The composition of protoxides. |
Hence † proˈtoxidate, † proˈtoxidize vbs. trans., to convert into a protoxide. rare—0.
| 1828–32 Webster, Protoxydize, to oxydize in the first degree. 1858 Mayne Expos. Lex., Protoxydatus, that which is converted into the state of a protoxide, as Ferrum protoxydatum: protoxidated. |