Final answer:
The terms 'Pleuro-' and 'Costo-' both refer to the 'rib' in anatomical terminology, describing parts related to the structure and function of the ribs in the body.
Step-by-step explanation:
The word parts Pleuro- and Costo- both refer to rib. The term pleura is used to describe the outer covering of the lungs as well as the inner lining of the thoracic cavity, and it is close to the ribs.
On the other hand, costal is a term that relates directly to the ribs themselves, for instance, costal cartilages are the cartilages that connect the ribs to the sternum. Both terms are part of the language used to identify parts and functions related to the rib structure in the body.