cistern

cis|tern /s'ɪstərn/ (cisterns)
1 [N-COUNT]
A cistern is a container which stores the water supply for a building, or that holds the water for flushing a toilet. (mainly BRIT; in AM, usually use tank)
= tank
2 [N-COUNT]
A cistern is a container for storing rain water. (mainly AM; in BRIT, usually use water butt)

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