Reservoir

A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted, as to supply a fountain, a canal, or a city by means of aqueducts, or to drive a mill wheel, or the like.

A small intercellular space, often containing resin, essential oil, or some other secreted matter.

lake used to store water for community use; a lake (natural or artificial) used to store water and used as a source of water

anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies; "an infectious agent depends on a reservoir for its survival"