Enter a clue or pattern or both:
The Clue
Underground reservoir (7 letter answer)
The Answer
CISTERN
Tags
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