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1660s, from French toxique, from Late Latin toxicus "poisoned," from Latin toxicum "poison," from Greek toxikon (pharmakon) "(poison) for use on arrows," from toxikon, neuter of toxikos "pertaining to arrows or archery," and thus to a bow, from toxon "bow," probably from a Scythian word that also was borrowed into Latin as taxus "yew."
toxic tox·ic (tŏk'sĭk)
Of, relating to, or caused by a toxin or other poison.
Capable of causing injury or death, especially by chemical means; poisonous.