has part has part has_part characteristic of has modifier abnormal parietal bone morphology enlarged parietal bone increased size of the paired membranous bones located between the frontal and occipital bones that are large, curved and quadrilateral in outline, articulate with each other at the midline in the sagittal suture, and form most of the superior and lateral aspects of the cranium MPheno.ontology MP:0004421 enlarged parietal bones increased parietal bone size abnormal increased size tetrapod parietal bone