CISTERN

Definition:

1. [noun] a sac or cavity containing fluid especially lymph or cerebrospinal fluid
   
   
2. [noun] a tank that holds the water used to flush a toilet
   Synonyms: water tank
   
   
3. [noun] an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
   
   

Synonyms:

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Related Words:

• cesspool, cesspit, sink, sump
• rain barrel