1. A thread, wire, fillet, or the like, tied tightly around a blood vessel, the pedicle of a tumor, or other structure to constrict it.
2. In orthodontics, a wire or other material used to secure an orthodontic attachment or tooth to an archwire.
The information shown above for ligature is provided by Stedman's.
* Stedman's, part of Lippincott Williams & Wilkins, provide a comprehensive line of health-science publications for healthcare professionals and medical students.