Definition of parietals:
(adj) :
(anatomy) Of or relating to the wall of a body part, organ or cavity.
(adj) :
(anatomy) Of or relating to the parietal bones.
(n) :
(anatomy) Either of the two parietal bones, on the top and side of the skull.
(adj) :
Of or relating to college living and, especially, its regulation.
(n) :
(informal) Dormitory rules governing visits from members of the opposite sex.
(adj) :
(botany) Attached to the main wall of the ovary, and not to the axis; said of a placenta.