<unk> is the action of poison.<unk> may also refer to: * Biological toxicity * Toxin * Envenomation, when an animal injects its venom through a bite or sting * Secondary<unk> * Radiation<unk>  a biology concept * Catalyst<unk>  a chemistry concept * Neutron poison, a nuclear physics concept * Route<unk>  a computer network concept
Poisoning 
Water intoxication
Tin poisoning
Secondary poisoning
Paracetamol poisoning
Carbamate poisoning
Salicylate poisoning
Chromium toxicity