单词	ferric chloride
释义	ferric chloride noun : a deliquescent dark salt FeCl3 that readily hydrates to the yellow-orange form and that is used especially for etching, in sewage treatment, and as an astringent Word History First Known Use 1835, in the meaning defined above Medical Definition ferric chloride noun : a deliquescent salt FeCl3 that is used chiefly as an oxidizing agent, as a catalyst, as an etching agent in photoengraving, as a coagulant in treating industrial wastes, and in medicine in a water solution or tincture usually as an astringent or styptic
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