any substance that can impair function, cause structural damage, or otherwise injure the body

something that destroys, corrupts, etc

a substance that retards a chemical reaction or destroys or inhibits the activity of a catalyst

a substance that absorbs neutrons in a nuclear reactor and thus slows down the reaction. It may be added deliberately or formed during fission

to give poison to (a person or animal) esp with intent to kill

to add poison to

to taint or infect with or as if with poison

to turn (a person's mind) against

to retard or stop (a chemical or nuclear reaction) by the action of a poison

to inhibit or destroy (the activity of a catalyst) by the action of a poison