reservoir

US /ˈrez.ɚ.vwɑːr/
UK /ˈrez.ɚ.vwɑːr/
"reservoir" picture
1.

a large natural or artificial lake used as a source of water supply

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The city's water supply comes from a large reservoir.
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They built a new dam to create a bigger reservoir.
:
basincisterntankdamlake
2.

a supply or source of something

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He has a vast reservoir of knowledge about ancient history.
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The human body is a reservoir of energy.
:
storesupplystockreservepool