I. pə-ˈrī-ə-t ə l adjective
Etymology: Middle English, from Medieval Latin parietalis , from pariet-, paries wall of a cavity or hollow organ, from Latin, wall
Date: 15th century
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 ; especially : of or relating to parietals
II. noun
Date: 15th century
1. : a parietal part (as a bone, scale, or plate)
2. plural : the regulations governing the visiting privileges of members of the opposite sex in campus dormitories