:of or relating to the walls of a part or cavity
:attached to the main wall rather than the axis or a cross wall of a plant ovary
—used of an ovule or a placenta
:of or relating to college living or its regulation;
:of or relating to parietals (see 2parietal 2)
- All of this takes place in a residential environment no longer constrained by the parietal hours that the older set of today's parents will recall. One of the signature changes in the student revolt of the late sixties/early seventies was the end not only of curfew hours for residence halls but also of housing separated by sex.
- —Barrett Seaman