IPA: /ˈpoʊstˌkreɪniəl/
KK: /ˈpoʊstˌkræn.i.əl/
Relating to the parts of the body that are located behind the skull.
The postcranial skeleton includes all the bones except those of the head.
Postcranial → It is formed from "post-" (meaning after) and "cranial" (from Latin "cranium", meaning skull). The word "postcranial" refers to structures located behind or after the skull, typically in the context of anatomy.
Think of 'post-' meaning 'after' and 'cranial' relating to the 'skull' — so postcranial refers to parts that are located after the skull.