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English definition of “poison”

poison

noun  /ˈpɔɪ·zən/ us  

poison noun (SUBSTANCE)

[C/U] a substance that causes illness or death if swallowed, absorbed, or breathed into the body: [U] poison gas [C] Some cleaning products are poisons. [U] He sprayed the weeds with poison.
poisonous
adjective  /ˈpɔɪ·zə·nəs/ us  
The mushrooms they picked were poisonous.

poison

verb [T]  /ˈpɔɪ·zən/ us  

poison verb [T] (CAUSE HARM)

to cause serious harm to something: Jealousy poisoned our relationship. I don’t see why you think TV poisons people’s minds (= influences them in a bad way).

poison verb [T] (SUBSTANCE)

to cause a person or animal to take in poison, or to add poison to food or a liquid: He thinks someone is trying to poison him. Her tea was poisoned.
(Definition of poison from the Cambridge Academic Content Dictionary © Cambridge University Press)
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