'postero-parietal' originates from Latin, specifically the words 'posterus' and 'paries', where 'posterus' meant 'coming after, behind' and 'paries' meant 'wall'.

'postero-parietal' changed from Late Latin/New Latin anatomical terms 'posterior' (from 'posterus') and 'parietalis' (from 'paries') and eventually became the modern English compound term 'postero-parietal' used in anatomical and neuroanatomical descriptions.

Initially, it meant 'related to the posterior (rear) wall or area', but over time it evolved into its current specialized meaning of 'related to the posterior part of the parietal lobe or parietal region (in neuroanatomy)'.