The correct answer is "curve, swayback". This answer is derived from the given options "rod-shaped", "curve, swayback", and "loins (lower back)". Out of these options, "curve, swayback" is the only one that accurately describes the term "lord/o", which is commonly used in medical terminology to refer to a condition characterized by an excessive inward curvature of the lower back. Therefore, "curve, swayback" is the correct answer.