flexure

nouns

the state of being flexed (as of a joint)
is derived from
an angular or rounded shape made by folding
"a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow"
is derived from
act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
is derived from
is derived from