poison
noun
°A substance that is harmful or lethal to a living organism.
"We used a poison to kill the weeds."
°Something that harms a person or thing.
"Gossip is a malicious poison."
verb
°To use poison to kill or paralyse somebody.
°To pollute; to cause some part of the environment to become poisonous.
synonyms: contaminant, pollutant, toxin, venom more» , contaminate, pollute, taint, corrupt