flexure

noun

act of bending a joint
継ぎ目を曲げる行為

especially a joint between the bones of a limb so that the angle between them is decreased
2者間の角度が下がるための、特に手足の骨間の接合部
an angular or rounded shape made by folding
折り曲げることによってできる角のある形
- a fold in the napkin
  ナプキンの折り目
- a crease in his trousers
  彼のズボンの折り目
- a plication on her blouse
  彼女のブラウスのひだ
- a flexure of the colon
  結腸の屈曲部
- a bend of his elbow
  彼の肘の湾曲部
the state of being flexed (as of a joint)
柔軟性のある状態（関節）