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Fun fact: toxin meant arrow long ago, for taxus, (bark tree ?) which bow were made ofActually from ancient Greek "toxicon" (related to archery) which stems from "toxon" (bow, not arrow), that got into latin. The association (toxicon -> toxic as in poisonous) came due to the practice of using poisons in archery (to make for lethal arrowheads).
Greeks took the word from Scythians. Taxus, for the yew family of trees (poisonous), is related to that, but the transfer to latin as currently used was through "toxic(os)".