Definition of reservoir

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res·er·voir

r-vwär

, -vwôr

, -vôr

) KEY

NOUN:

A natural or artificial pond or lake used for the storage and regulation of water.
A receptacle or chamber for storing a fluid.
An underground accumulation of petroleum or natural gas.
Anatomy See cisterna.
A large or extra supply; a reserve: a reservoir of good will.
Medicine An organism or a population that directly or indirectly transmits a pathogen while being virtually immune to its effects.

ETYMOLOGY:
French réservoir, from réserver, to reserve, from Old French reserver ; see reserve

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