Adjective: Parietal (puh-RYE-uh-tul)
1. Of or relating to the walls of a part or cavity. Also, of, relating to, or forming the upper posterior wall of the head
2. Attached to the main wall rather than the axis or a cross wall of a plant ovary — used of an ovule or a placenta.
3. Of or relating to college living or its regulation; especially :of or relating to the regulations governing the visiting privileges of members of the opposite sex in campus dormitories.
Sample sentence: In the 1950s, male college students served in the military but couldn’t vote, and colleges imposed parietal rules, which kept young men out of women’s dorms.