toxic(a = adj.all) - of or relating to or caused by a toxin or poison; "suffering from exposure to toxic substances"
Antonym: nontoxic
Derived forms noun toxicity₁, noun toxin₁

   Of or pertaining to poison; poisonous; as, toxic medicines. [1913 Webster]

toxic, adj.
1 of or relating to poison (toxic symptoms).
2 poisonous (toxic gas).
3 caused by poison (toxic anaemia).

Derivative:
toxically adv. toxicity n.

Etymology:
med.L toxicus poisoned f. L toxicum f. Gk toxikon (pharmakon) (poison for) arrows f. toxon bow, toxa arrows

N  insalubrity, unhealthiness, nonnaturals, plague spot, malaria, death in the pot, contagion, toxicity, insalubrious, unhealthy, unwholesome, noxious, noisome, morbific, morbiferous, mephitic, septic, azotic, deleterious, pestilent, pestiferous, pestilential, virulent, venomous, envenomed, poisonous, toxic, toxiferous, teratogenic, narcotic, contagious, infectious, catching, taking, epidemic, zymotic, epizootic, innutritious, indigestible, ungenial, uncongenial, deadly.

toxic condition, toxic dumpsite, toxic industrial waste, toxic shock, toxic shock syndrome, toxic site, toxic waste, toxic waste area, toxic waste dump, toxic waste site