IPA: //ˌdaɪəˈfɪziəl//
KK: /daɪəˈfɪziəl/
Relating to the diaphysis, which is the main or central part of a long bone.
The doctor explained that the fracture was located in the diaphyseal region of the bone.
Diaphyseal is formed from "dia-" (meaning through or across) and "physis" (from Greek "phusis", meaning growth or nature). The term refers to the part of a long bone that is situated between the ends, indicating the area through which growth occurs.
Think of 'through' ('dia-') and 'growth' ('physis') to remember that 'diaphyseal' refers to the part of a bone where growth happens.