cistern
noun /ˈsɪstən/
/ˈsɪstərn/
- enlarge imagea 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 - lavatory
词源Middle English: from Old French cisterne, from Latin cisterna, from cista ‘box’, from Greek kistē.
