a container in which water is stored in a building, especially one in the roof or connected to a toilet (尤指屋顶上的)蓄水箱,贮水箱;(抽水马桶的)水箱 Topics Houses and homesc2Oxford Collocations DictionaryCistern is used after these nouns:- lavatory
Word OriginMiddle English: from Old French cisterne, from Latin cisterna, from cista ‘box’, from Greek kistē.