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reservoir (n.)
1680s, "a place where something tends to collect," 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 "artificial basin to collect and store a large body of water" is from 1705.
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Definitions of reservoir from WordNet
Dictionary entries near reservoir
resentment
reservation
reserve
reserved
reservist
reservoir
reset
resettle
resettlement
reshape
reshuffle