cistern

Noun
  1. A sac or cavity containing fluid especially lymph or cerebrospinal fluid (synset 105524362)
    is a type of: sac - a structure resembling a bag in an animal
    same as: cisterna
  2. A tank that holds the water used to flush a toilet (synset 103039700)
    is a type of: storage tank, tank - a large (usually metallic) vessel for holding gases or liquids
    same as: water tank
  3. An artificial reservoir for storing liquids;
    Especially an underground tank for storing rainwater (synset 103039495)
    is a type of:
    • pool - an excavation that is (usually) filled with water
    • reservoir - tank used for collecting and storing a liquid (as water or oil)
    subtypes:

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