APA Dictionary of Psychology

n. a subdivision of an organ, such as the brain or the lungs, particularly when rounded and surrounded by distinct structural boundaries, such as fissures. The four main lobes of each cerebral hemisphere of the brain are the frontal lobe, parietal lobe, temporal lobe, and occipital lobe. There are also subdivisions of each of these lobes; for example, the temporal lobe comprises the inferior, middle, and superior temporal lobes. —lobar adj. —lobate adj.