noun Chemistry.
a salt of the hypothetical ferric acid, H 2 FeO 4 .

1850–55; < Latin ferr(um) iron + -ate2

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World English Dictionary
ferrate (ˈfɛreɪt)
a salt containing the divalent ion, FeO42--. Ferrates are derivatives of the hypothetical acid H2FeO4
[C19: from Latin ferrum iron]

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American Heritage
Science Dictionary
ferrate   (fěr'āt')  Pronunciation Key 
A compound containing ferric oxide and another oxide. Ferrates are stable only in strongly alkaline conditions and impart a purple color to aqueous solutions.
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Example sentences
As a liquid, ferrate can be injected into the process stream without the addition of special mixing equipment.
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