"reservoir" in the noun sense
a large or extra supply of something
"a reservoir of talent"
2. reservoir, artificial lake, man-made lake
lake used to store water for community use
tank used for collecting and storing a liquid (as water or oil)
4. reservoir, source
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"
Source: WordNet® (An amazing lexical database of English)
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