cistern
noun /ˈsɪstən/
/ˈsɪstərn/
- a container in which water is stored in a building, especially one in the roof or connected to a toiletTopics Houses and homesc2
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Oxford Collocations DictionaryCistern is used after these nouns:- lavatory
Word OriginMiddle English: from Old French cisterne, from Latin cisterna, from cista ‘box’, from Greek kistē.