Adjective

1. Of or pertaining to the wall of a body part, organ or cavity.
2. Of or pertaining to the parietal bones

   Hydrochloric acid is secreted by the parietal cells of the gastric glands, located on the wall of the fundus of the stomach

3. Of or related to college living and, especially, its regulation.

Noun

1. Either of the two parietal bones, on the top and side of the skull.

Adjective

1. parietal, pertaining to the parietal region of the head