Parietal lobe: Part of the brain, specifically the section of the cerebral hemisphere that lies beneath the parietal bone, the main side bone of the skull. The word "parietal" comes from the Latin "parietalis" meaning "belonging to the wall." SLIDESHOW Brain Food Pictures: What to Eat to Boost Focus See Slideshow From Brain and Nervous System Resources Understanding Plexiform Neurofibromas Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19