Etymology
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parietal (adj.)

early 15c., "pertaining to the walls of a cavity in the body," from Late Latin parietalis "of walls," from Latin paries (genitive parietis) "wall" (of a building), a word of unknown origin. In U.S. also "pertaining to the residents and rules of a college or university" (1837; compare intramural). Combining form is parieto-.

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Definitions of parietal

parietal (adj.)
of or relating to or associated with the parietal bones in the cranium;
parietal lobe
From wordnet.princeton.edu