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Synonyms
res·er·voir (rĕźər-vwäŕ, -vwôŕ, -vôŕ)

[French réservoir, from réserver, to reserve, from Old French reserver; see reserve.]

noun 

  1. A natural or artificial pond or lake used for the storage and regulation of water.
  2. A receptacle or chamber for storing a fluid.
  3. An underground accumulation of petroleum or natural gas.
  4. Anatomy See cisterna
  5. A large or extra supply; a reserve: a reservoir of good will.
  6. Medicine An organism or a population that directly or indirectly transmits a pathogen while being virtually immune to its effects.
cis·ter·na (sĭ-stûŕnə)

[Latin, cistern; see cistern.]

noun: pl., -nae (-nē) 

  1. Anatomy A fluid-containing sac or cavity in the body of an organism. Also called reservoir
  2. Cytology One of the saclike vesicles that comprise the endoplasmic reticulum.

derivatives

cis·teŕnal
adjective