(intrauterine system) a hormonal contraceptive device consisting of a plastic T-shaped frame that is inserted into the uterus. It carries a progestogen (levonorgestrel) in a sleeve around its stem and has two fine threads attached to its base, by which it can be removed. It provides a long-term method of contraception that is also reversible. The IUS is also used in the treatment of menorrhagia. Trade name: Mirena.
Subjects: Medicine and Health.