Substance that causes death, injury or harm to organs
In science, Poison is one of the chemical substances that is harmful or lethal to a living organism. The term of Poison is used in a wide range of scientific fields and industries, where it is often specifically defined. It may also be applied colloquially or figuratively, with a broad sense. . The symptoms and effects of poisoning in humans can mimic those of other medical conditions and vary depending on the type of poison and the system of the body affected. Common symptoms include alterations in consciousness, abnormal body temperature, irregular heart rate, and changes in respiration.
https://en.wikipedia.org/wiki/Poison