<unk> is a common name for Toxicodendron radicans, a poisonous plant, and two other poisonous plant species.<unk> or<unk> may also refer to:
Poison ivy 
Strychnine poisoning
Theobromine poisoning
Scombroid food poisoning
Carbamate poisoning
Mushroom poisoning
Shellfish poisoning
Ethylene glycol poisoning