reservoir

noun
res·​er·​voir | \ ˈre-zə-ˌvwär How to pronounce reservoir (audio) , -zər-, -ˌvwȯr also -ˌvȯi How to pronounce reservoir (audio) \

Definition of reservoir

1 : a place where something is kept in store: such as
a : an artificial lake where water is collected and kept in quantity for use
b : a part of an apparatus in which a liquid is held
c : supply, store a large reservoir of educated people
2 : an extra supply : reserve
3 : an organism in which a parasite that is pathogenic for some other species lives and multiplies usually without damaging its host

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Examples of reservoir in a Sentence

The pen has a large ink reservoir. Colleges and universities provide reservoirs of talent for job recruiters. She found the reservoirs of energy she needed to finish the job.
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Recent Examples on the Web

In March, with the river’s main reservoirs now below half of total capacity and the federal government about to step in, the states reached a temporary deal to cut river water use. The Washington Post, The Denver Post, "Trading water for cash along the Colorado River," 20 Aug. 2019 Well-fed and ready to roll, your next stop is Lac du Ballon, a reservoir on the slopes of the highest mountain in the Vosges, Grand Ballon. Tyler Moss, Condé Nast Traveler, "An Autumnal Road Trip Through Alsace Wine Country," 13 Aug. 2019 Under the proposal, the water district would replace a small, existing dam and reservoir on the site. Paul Rogers, The Mercury News, "Environment report out on new $1 billion dam proposed for Santa Clara County," 9 Aug. 2019 The system’s three reservoirs are owned and operated by the city, but located in Baltimore County. Alison Knezevich, baltimoresun.com, "Should the Baltimore water system be overseen by a regional authority?," 29 July 2019 The company on July 14 reported a 20,000-gallon spill east of Williston and about a mile from Lake Sakakawea, the largest reservoir on the Missouri River. USA TODAY, "Leaping frogs, spiny lobsters, hostile roosters: News from around our 50 states," 26 July 2019 Engineers and academics are starting to talk about ways to diminish the river’s flow safely in the future—by creating new reservoirs upstream, or perhaps restoring wetlands. The Economist, "A new threat to New Orleans," 26 July 2019 The creation of Lake Nasser, a 298-mile-long artificial reservoir upriver from the dam, and whose southern limits extend into Sudan, would require the resettlement of 90,000 people. Esther Pons, National Geographic, "Epic engineering rescued colossal ancient Egyptian temples from floodwaters," 17 July 2019 The potential benefit would be to avoid the large capital construction, and large geographic footprint, that comes with building new reservoirs because these aquifers already exist. New York Times, "Climate Change Fills Hurricanes With More Rain, Analysis Shows," 11 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'reservoir.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of reservoir

1690, in the meaning defined at sense 1

History and Etymology for reservoir

French réservoir, from Middle French, from reserver

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More Definitions for reservoir

reservoir

noun

English Language Learners Definition of reservoir

: a usually artificial lake that is used to store a large supply of water for use in people's homes, in businesses, etc.
: a place (such as a part of a machine) where a liquid is stored
: an extra supply of something

reservoir

noun
res·​er·​voir | \ ˈre-zər-ˌvwär How to pronounce reservoir (audio) \

Kids Definition of reservoir

: a place where something (as water) is kept in store for future use

reservoir

noun
res·​er·​voir | \ ˈrez-ə(r)v-ˌwär How to pronounce reservoir (audio) , -ə(r)v-ˌ(w)ȯr How to pronounce reservoir (audio) \

Medical Definition of reservoir

1 : a space (as an enlargement of a vessel or the cavity of a glandular acinus) in which a body fluid is stored
2 : an organism in which a parasite that is pathogenic for some other species lives and multiplies without damaging its host also : a noneconomic organism within which a pathogen of economic or medical importance flourishes without regard to its pathogenicity for the reservoir rats are reservoirs of plague — compare carrier sense 1a