Definition of parietal
& Biology of, relating to, attached to, or denoting the wall of the body or of a body cavity or hollow structure.
of the parietal lobe:the parietal cortex 2North American relating to residence in a college or university dormitory and especially to visits from members of the opposite sex:parietal rules 3 Archaeology denoting prehistoric art found on rock walls.
& Zoology a parietal structure.
) informal dormitory rules governing visits from members of the opposite sex.