1 causing death or illness if swallowed or absorbed into the body
SYNTOXIC:
poisonous chemicals / plants * This gas is highly poisonous. * The leaves of certain trees are poisonous to cattle.
2 (of animals and insects) producing a poison that can cause death or illness if the animal or insect bites you
SYNVENOMOUS:
poisonous snakes * a tiny spider with a poisonous bite
3 extremely unpleasant or unfriendly:
a poisonous person * the poisonous atmosphere in the office
