torsion
[C/U] Both
This term describes a specific mechanical stress where an object is twisted around its own axis. It is a technical term used primarily in physics, engineering, and anatomy to describe a rotational force that creates internal tension, rather than a simple bend or pull.
Uncountable when referring to the general physical phenomenon of twisting force. Countable when referring to a specific medical event or a distinct instance of twisting in a mechanical system.