noun
octagonal burial mound
Historical term for an octagonal-shaped burial mound built during the Kofun period (ca. 3rd–7th century).
八角墳は古墳時代後期の有力者の墓と考えられている。
Octagonal burial mounds are thought to be the tombs of powerful figures from the late Kofun period.
八角 (octagonal) + 墳 (burial mound). The term refers to a specific shape of ancient Japanese tomb.