noun
ligature
LIG-uh-cher/ˈlɪɡətʃər/
A binding that joins separate parts together.
The tightly knotted cord forms a ligature around the two rods.

Etymology
Here binding gives its name to the thing used to bind: the Latin noun meant “a band.” A ligature is thus the cord or thread used for tying, rather than the act itself.
In context
He then tied off the artery with a ligature.
Then square knots are added to keep everything in place. This ligature is often used near where the vessel is being cut
More examples
- The surgeon ties a ligature around the blood vessel.
- Tiny elastic ligatures secure the wire to the brackets on her braces.
- He loosens the metal ligature to replace the reed.
Forms
ligature · ligatures
ligate verb — To tie or bind with a ligature.