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Synonyms
poi·son (poízən)

[Middle English, from Old French, from Latin pōtiō, pōtiōn-, drink.]

noun 

  1. A substance that causes injury, illness, or death, especially by chemical means.
  2. Something destructive or fatal.
  3. Chemistry & Physics A substance that inhibits another substance or a reaction: a catalyst poison.

transitive verb: -soned, -son·ing, -sons. 

  1. To kill or harm with poison.
  2. To put poison on or into: poisoning arrows; poisoned the drink.
    1. To pollute: Noxious fumes poison the air. See synonyms at contaminate
    2. To have a harmful influence on; corrupt: Jealousy poisoned their friendship.
  4. Chemistry & Physics To inhibit (a substance or reaction).

adjective 

Poisonous.

derivatives

poíson·er
noun