/ ˈtɒksɪk; NAmE ˈtɑːk-/ adjective
containing poison; poisonous :
toxic chemicals / fumes / gases / substances
to dispose of toxic waste
Many pesticides are highly toxic .
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WORD ORIGIN
mid 17th cent.: from medieval Latin toxicus poisoned, from Latin toxicum poison, from Greek toxikon (pharmakon) (poison for) arrows, from toxon bow.