tox ‧ ic /ˈtɒksɪk $ ˈtɑːk-/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Late Latin ; Origin: toxicus , from Latin toxicum 'poison' , from Greek toxikon 'arrow poison' , from toxon 'bow, arrow' ]
containing poison, or caused by poisonous substances ⇨ toxin :
fumes from a toxic waste dump
toxic chemicals/substances/fumes/gases
Toxic chemicals were spilled into the river.
a highly toxic pesticide
—toxicity /tɒkˈsɪsəti, tɒkˈsɪsɪti $ tɑːk-/ noun [uncountable and countable] :
The metal has a relatively low toxicity to humans.