P0271200 (frĭ-nŏl′ə-jē)n. The study of the shape and protuberances of the skull, based on the now discredited belief that they reveal character and mental capacity.phren′o·log′ic(frĕn′ə-lŏj′ĭk, frē′nə-), phren′o·log′i·cal(-ĭ-kəl) adj.phre·nol′o·gist n.Thesaurus