I. pəˈrīəd. ə l adjective
Etymology: Middle French, from New Latin pariet-, paries + Middle French -al
1.
a. : of or relating to the walls of a part or cavity
parietal peritoneum
— compare visceral
b. : of, relating to, or located in the upper posterior part of the head ; specifically : relating to either of the pair of bones that form the cranial roof of this part of the skull
2. of a plant part : peripheral in location or orientation ; especially : attached to the main wall rather than the axis or a cross wall of an ovary — used of an ovule or a placenta
3. : of or relating to life within college walls or its order and regulation ; especially : of or relating to the visitation regulations for members of the opposite sex in dormitories
4. : of, relating to, or appearing on a wall
upon the wall … some work of parietal art — G.B.Brown
II. noun
( -s )
: a parietal part (as a bone, scale, or plate)
III. noun
parietals plural : the regulations governing the visiting privileges of members of the opposite sex in campus dormitories