Definition of Reservoir

Reservoir: 1. A place where something such as water is kept in reserve.
2. The part of a device in which something is kept in reserve or stored, as an Ommaya reservoir.
3. For an infectious agent, an animal, person, plant, soil, or other substance in which the agent normally abides. See: Reservoir of infection.
From the French reservoir, from reserver meaning to reserve.

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