👉 Poister is a term used in medicine to describe the formation of pus cells within the body. It's often described as "poisonous" or "irritating," but it also refers to the accumulation of fluid and pus in an area, such as on the skin or in the lining of the mouth or nose. In some cases, poister can refer to a specific type of infection that is characterized by the presence of pus cells within the body.