Treated with or containing antimoniate; combined with antimony in the form of an antimonate compound.
Past participle of 'antimoniate' (verb), formed by adding -ed to indicate a completed action or resulting state. The verb itself is a back-formation from the noun antimoniate.
This word shows how chemistry creates its own grammar—you can 'antimoniate' a substance (add antimoniate to it) and then call it 'antimoniated,' much like how you can 'chlorinate' water and get 'chlorinated' water. It's precision naming for precision work.
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