adjective

1. ☆ of or having to do with life in a college, esp. with rules (parietals) governing visiting in dormitories by members of the opposite sex
2. Anat. of, pertaining to, or forming the walls of a cavity or hollow structure; esp., designating either of the two bones between the frontal and occipital bones, forming part of the top and sides of the skull
3. Bot. attached to the wall of the ovary, as the placenta in some plants

Etymology: Fr pariétal < LL parietalis < L paries: see paries