flexure

noun

1.
the state of being flexed (as of a joint)
flection flexion
Derived from:
flex
2.
an angular or rounded shape made by folding
frumple rivel bend crease crimp fold plication
Derived from:
flex
3.
act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
flexion
Derived from:
flex