TOXIC

I. adjective Etymology: Late Latin ~us, from Latin ~um poison, from Greek toxikon arrow poison, from neuter of toxikos of a bow, from toxon bow, arrow Date: 1664 containing or being poisonous material especially when capable of causing death or serious debilitation , exhibiting symptoms of infection or ~osis , extremely harsh, malicious, or harmful , ~ity noun II. noun Date: 1890 a ~ substance