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The Clue

Underground reservoir (7 letter answer)

The Answer

CISTERN

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Notes

The answer CISTERN is so rare that it appears less than once every 2500 puzzles.

Related Clues

Well
Rainwater tank
Underground water tank

Definition

CISTERN as a noun:

1. (cisterna, cistern) = a sac or cavity containing fluid especially lymph or cerebrospinal fluid
2. (cistern, water tank) = a tank that holds the water used to flush a toilet
3. an artificial reservoir for storing liquids; especially an underground tank for storing rainwater