• (a.) Of or pertaining to the diameter of the cranium, from one parietal fossa to the other.
Bi`pa·ri'e·tal adjective [ Prefix bi- + parietal .] (Anat.) Of or pertaining to the diameter of the cranium, from one parietal fossa to the other. 
Type: Term Pronunciation: bī′pa-rī′ĕ-tăl Definitions: 1. Relating to both parietal bones of the cranium.
biparietal 1. Relating to the parietal bones of the skull; specifically, being a measurement between the most distant opposite points of the two parietal bones. 2. Of or pertaining to the diameter of the cranium, from one parietal fossa to the other.
of or pertaining to both parietal bones, esp. in their being determinants in measurements of the breadth of the skull.