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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hypothetical acid, with chemical formula H2FeO4, known only as its salts

from the GNU version of the Collaborative International Dictionary of English

  • adj. an acid, H2FeO4, which is not known in the free state, but forms definite salts, analogous to the chromates and sulphates.


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