This is the 9627th most frequent Japanese word.
股
"股" (mota) refers to the "thigh," "groin," or "leg branch" (e.g., split/branching parts of the body).
In this context, '股' is part of the compound term '股関節' meaning 'hip joint', indicating a specific anatomical location in the body.
股関節が痛いです。
My hip joint hurts.
The word '股' is used metaphorically to describe the forked shape of the road, resembling the division like a human's groin area.
道が分かれて股になっています。
The road splits and forms a fork.
Here, '股' refers to the groin area or the inner side of the thighs, commonly used to describe the posture of spreading legs.