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cistern (noun) a large water tank.
A large tank for storing water, usually on or inside a building is a cistern. A storage tank is a cistern. A cistern comes in handy when a water supply system breaks down.
- The cistern in the roof of the college toilets has capacity to store enough water for three days.
- The water stored in the cistern and let flow through pipes is not only a little dirty, but is also giving out bad smell. Time the cistern was cleaned.