a substance causing death or harm of absorbed by a living thing (animal or plant)

substance that causes harm, death

having poison; causing death or injury

harmful

causing, caused by infection (with disease germs)

harmful

poisonous (the usual word)

poisonous

a poisonous substance

poison

deadly; spiteful

poisonous; hateful

(of a person) strong; (of ill-feeling, hatred) very strong; (of words etc) full hatred; (of a disease etc) very dangerous

poisonous, lethal