penthouse
/ˈpenthaʊs/noun
1
- a flat on the top floor of a tall building, typically luxuriously fitted and offering fine views（高层建筑的）顶层套间; （尤指景色优美装饰豪华的）顶层公寓。
2
- archaic an outhouse or shelter built on to the side of a building, having a sloping roof〈古〉披屋; （在某建筑物边搭建的）单斜顶棚, 遮棚。
词源
Middle English pentis (in sense 2), shortening of Old French apentis, based on late Latin appendicium 'appendage', from Latin appendere 'hang on'. The change of form in the 16th cent. was by association with French pente 'slope' and HOUSE.