cis
tern
Plural
cisterns
1
a container that stores water needed for flushing a toilet, often stored in the roof
A cistern is a container or tank used to store water in toilets. The cistern holds water used for flushing, releasing it when the flush mechanism is activated. It is usually located above or behind the toilet bowl and can be concealed inside the wall or part of a visible unit. Cisterns are typically made from materials like plastic, ceramic, or metal and are designed to refill automatically after each use.
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2
an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
3
a sac or cavity containing fluid especially lymph or cerebrospinal fluid
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