Definitions of cistern

1. an artificial reservoir for storing liquids; especially an underground tank for storing rainwater

2. a tank that holds the water used to flush a toilet

3. Any receptacle for holding water or other liquid: a reservoir.

4. A reservoir for water.

5. A reservoir for holding water.

6. A receptacle for water or other liquids; a reservoir; a place containing water.

7. An oblong or square box for storing water for domestic use; a hollow place or pond for containing water; a reservoir.