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cistern

1 ENTRIES FOUND:
cistern /ˈsɪstɚn/ noun
plural cisterns
cistern
/ˈsɪstɚn/
noun
plural cisterns
Britannica Dictionary definition of CISTERN
[count]
: a container that holds a supply of water: such as
US : an underground container that is used for collecting and storing rainwater
British : a tank that holds the water for a toilet
British : a tank on the roof of a building that holds water for the building