Costosternal

Part of speech: adjective

Definitions

1. Relating to the area where the ribs meet the sternum, indicating a connection or junction between these two structures
2. Pertaining to the anatomical region formed by the convergence of the costal cartilages and the sternum
3. Describing the interaction between the ribs and the breastbone in the context of human anatomy

Etymology: "Costosternal" is a plain anatomical compound, built from "costo-", a combining form from Latin "costa" meaning "rib", and "sternal", relating to the sternum, the flat bone at the front of the chest. Put together, the word describes the junctions where the ribs meet that breastbone, the places where the costal cartilages attach to the sternum. The word is a technical coinage of modern medical description rather than an ancient term, so no ancient anatomist used it. Its parts do the work directly: the first half names the rib and the second names the breastbone, and the adjective ending "-al" turns the pairing into a description of location and connection.