[pa.ri.e.tal] adj [MF, fr. NL pariet-, paries wall of a cavity or hollow organ, fr. L, wall] (15c) 1 a: of or relating to the walls of a part or cavity b: 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; esp: of or relating to parietals
[2]parietal n (15c) 1: a parietal part (as a bone, scale, or plate)
2. pl: the regulations governing the visiting privileges of members of the opposite sex in campus dormitories