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English definition of “poison”

poison

noun [C/U] (SUBSTANCE)   /ˈpɔɪ·zən/
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    /ˈpɔɪ·zə·nəs/ adjective The mushrooms they picked were poisonous.
(Definition of poison noun (SUBSTANCE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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