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n.
a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
adv.
at an earlier time or formerly; "she had previously lived in Chicago"; "he was previously president of a bank"; "better than anything previously proposed"; "a previously unquestioned attitude"; "antecedently arranged"