hip joint; groin area
Refers to the area where the leg meets the torso, including the hip joint and upper groin. Often used in medical, anatomical, or everyday contexts.
I went to the hospital because my hip joint hurts.
It feels good to stretch the groin area.
鼠径 is the medical term for the groin region, more technical than 足の付け根.
Compound of 足 (あし, 'leg') + の (possessive particle) + 付け根 (つけね, 'base, joint'). The term 付け根 itself derives from 付ける (つける, 'to attach') + 根 (ね, 'root').