Dictionary & Thesaurus

cistern

1.	(noun) an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
	Related Words: cesspit, cesspool, pool, rain barrel, reservoir, sink, sump

2.	(noun) holds the water used to flush a toilet
	Synonyms: water tank
	Related Words: storage tank, tank

3.	(noun) a sac or cavity containing fluid especially lymph or cerebrospinal fluid
	Synonyms: cisterna
	Related Words: sac