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Synonyms
tox·ic (tŏḱsĭk)

[Late Latin toxicus, from Latin toxicum, poison, from Greek toxikon, poison for arrows, poison from neuter of toxikos, of a bow, from toxon, bow, from Old Persian* taxša-, an arrow.]

adjective 

  1. Of, relating to, or caused by a toxin or other poison: a toxic condition; toxic hepatitis.
  2. Capable of causing injury or death, especially by chemical means; poisonous: food preservatives that are toxic in concentrated amounts; a dump for toxic industrial wastes. See synonyms at poisonous

noun 

A toxic chemical or other substance.

derivatives

tox́i·cal·ly
adverb