noun
A traditional Japanese portable lantern with a cylindrical paper shade, often used in historical or festival settings.
時代劇で、夜道を歩く人が丸行灯を持っている。
In period dramas, people walking at night carry a cylindrical paper lantern.
行灯 is a general term for a portable paper lantern, while 丸行灯 specifically refers to the cylindrical type.
Compound of 丸 (round) and 行灯 (paper lantern). The exact historical derivation is uncertain, but the word describes the lantern's shape.