reservoir

Short definition from Wiktionary

Noun

1. 1
   A place where anything is kept in store.
2. 2
   A large natural or artificial lake used as a source of water supply.
3. 3
   A small intercellular space, often containing resin, essential oil, or some other secreted matter.
4. 4
   A supply or source of something.
5. 5
   A species that acts as host to a zoonosis when it is not causing acute illness in other susceptible species.
6. 6
   A "black box" component that receives an input signal to be read out and mapped by another process, as part of reservoir computing.

Verb

1. 1
   To store or keep (something) in or as in a reservoir.