blue-glazed roof tile
Refers to a traditional Japanese roof tile with a blue glaze, often seen on temples and historic buildings.
お寺の屋根には瑠璃瓦が使われている。
Blue-glazed roof tiles are used on the temple roof.
Compound of 瑠璃 (ruri, 'lapis lazuli; deep blue') and 瓦 (kawara, 'roof tile').