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residence
residency
resident
resident commissioner
residential
residential care
residential counselor
residential school
residentiary
residents’ association
residual
residual claim
residual method
residual oil
residual unemployment
residual value
residuary
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reservoir

res·er·voir [ rézzər vwr ] (plural res·er·voirs)


noun 
Definition:
 
1. lake or tank for storing water: a large tank or natural or artificial lake used for collecting and storing water for human consumption or agricultural use

2. large backup supply: a substantial reserve supply of something intangible

3. liquid store in device: a part of a machine or device where liquid is stored for use by the machine or device

4. underground supply of gas or oil: a natural chamber in porous rock where a supply of natural gas or crude oil collects

5. biology parasite carrier: an organism in which a parasite lives and develops without damaging it, but from which the parasite passes to another species that is damaged by it

6. anatomy 
Same as  cisterna


[Mid-17th century. < French< réserver (see reserve)]
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