reservoir Hear it!

reservoir definition

res·er·voir (rezər vwär′, rezə-; -vwôr, -vôr′)

noun

  1. a place where anything is collected and stored, generally in large quantity; esp., a natural or artificial lake or pond in which water is collected and stored for use
  2. a receptacle or part (in an apparatus) for holding a fluid, as oil, ink, etc.
  3. a large supply; esp., an extra or reserve supply
  4. Biol.
    1. a part, sac, or cavity in some animals or plants in which fluid collects or into which products are secreted
    2. a species of organism that serves as an immune host for a parasite that can cause disease in another species

Etymology: Fr réservoir < réserver: see reserve

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