reservoir
//ˈrez.ə.vwɑːr//
Noun
reservoirSingular
reservoirsPlural
1
A large natural or artificial lake used as a source of water supply.
The city built a new reservoir to supply water to the growing population.
2
A place where fluid collects, especially in rock strata or in the body.
The geologists discovered a natural oil reservoir deep beneath the earth's surface.
3
A supply or source of something, especially information or knowledge.
The library is a reservoir of knowledge for students.