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reservoir (n.)

1680s, "a place where something tends to collect, place where anything is kept in store," originally figurative, from French réservoir "storehouse," from Old French reserver "set aside, withhold," from Latin reservare "keep back, save up; retain, preserve," from re- "back" (see re-) + servare "to keep, save, preserve, protect" (from PIE root *ser- (1) "to protect").

Specific meaning "capacious artificial basin to collect and store water" is from 1705. Earlier in this sense, and more common late 17c.-early 18c., was reservatory (1660s). Meaning "part of a machinery in which fluid is contained" is by 1784.

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Definitions of reservoir from WordNet

reservoir (n.)
a large or extra supply of something;
a reservoir of talent
reservoir (n.)
lake used to store water for community use;
Synonyms: artificial lake / man-made lake
reservoir (n.)
tank used for collecting and storing a liquid (as water or oil);
reservoir (n.)
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
Synonyms: source
From wordnet.princeton.edu