D defs.my
Entry 2 senses Webster, 1913

Cistern

/sĭs'-tẽrn/ · Cis·tern · IPA /ˈsɪs.tɚn/
01 n. An artificial reservoir or tank for holding water, beer, or other liquids.
  1. 1.
    An artificial reservoir or tank for holding water, beer, or other liquids.
  2. 2.
    A natural reservoir; a hollow place containing water.