noun
Anatomical term for muscles that draw a limb or part toward the midline of the body. Opposite of 外転筋 (abductor muscle).
See also: 外転筋
太ももの内転筋を鍛えると、歩行が安定します。
Strengthening the thigh adductor muscles stabilizes your walking.
外転筋 is the abductor muscle, which moves a limb away from the body's midline, the opposite action of 内転筋.
Compound of 内転 (adduction) + 筋 (muscle). The term is a modern anatomical coinage using kanji for their meanings.