👉 The term "hallux" in relation to the femur (the long bone of the leg) is a part of the human body. It is also known as the "femoral groove". The word "hallux" comes from the Latin phrase "hallus" which means "foot," and "xilla" which means "glove." Therefore, it refers to the area where the hip joint occurs between the femur and the tibia (the small bones in the leg).