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reservoir

[rez-er-vwahr, -vwawr, -vawr, rez-uh-]
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noun
  1. a natural or artificial place where water is collected and stored for use, especially water for supplying a community, irrigating land, furnishing power, etc.
  2. a receptacle or chamber for holding a liquid or fluid.
  3. Geology. See under pool1(def 6).
  4. Biology. a cavity or part that holds some fluid or secretion.
  5. a place where anything is collected or accumulated in great amount.
  6. a large or extra supply or stock; reserve: a reservoir of knowledge.
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Origin of reservoir

1680–90; < French réservoir, equivalent to réserv(er) to reserve + -oir -ory2

Synonyms

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pool1

[pool]
noun
  1. a small body of standing water; pond.
  2. a still, deep place in a stream.
  3. any small collection of liquid on a surface: a pool of blood.
  4. a puddle.
  5. swimming pool.
  6. a subterranean accumulation of oil or gas held in porous and permeable sedimentary rock (reservoir).
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verb (used without object)
  1. to form a pool.
  2. (of blood) to accumulate in a body part or organ.
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verb (used with object)
  1. to cause pools to form in.
  2. to cause (blood) to form pools.
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adjective
  1. of or for a pool: pool filters.
  2. taking place or occurring around or near a pool: a pool party.
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Origin of pool1

before 900; Middle English; Old English pōl; cognate with Dutch poel, German Pfuhl
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

tank, supply, stockpile, storage, lake, source, container, cistern, pond, basin, pool, reserve, spring, fund, backlog, receptacle, holder, store, stock, tarn

Examples from the Web for reservoir

Contemporary Examples

Historical Examples

  • She speedily descended to the reservoir of water, and filled her pitcher.

  • There's a reservoir below into which they drop when the electric circuit is broken.

  • But she was drifting in her blind misery to that reservoir of life, London.

    A Son of Hagar

    Sir Hall Caine

  • After leaving the reservoir we drove through another quarter of the town.

    The Last Voyage

    Lady (Annie Allnutt) Brassey

  • Could he have siphoned the water from one reservoir to the other?

    Common Science

    Carleton W. Washburne


British Dictionary definitions for reservoir

reservoir

noun
  1. a natural or artificial lake or large tank used for collecting and storing water, esp for community water supplies or irrigation
  2. a receptacle for storing gas, esp one attached to a stove
  3. biology a vacuole or cavity in an organism, containing a secretion or some other fluid
  4. anatomy another name for cisterna
  5. a place where a great stock of anything is accumulated
  6. a large supply of something; reservea reservoir of talent
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Word Origin

C17: from French réservoir, from réserver to reserve

pool1

noun
  1. a small body of still water, usually fresh; small pond
  2. a small isolated collection of liquid spilt or poured on a surface; puddlea pool of blood
  3. a deep part of a stream or river where the water runs very slowly
  4. an underground accumulation of oil or gas, usually forming a reservoir in porous sedimentary rock
  5. See swimming pool
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Word Origin

Old English pōl; related to Old Frisian pōl, German Pfuhl

pool2

noun
  1. any communal combination of resources, funds, etca typing pool
  2. the combined stakes of the betters in many gambling sports or games; kitty
  3. commerce a group of producers who conspire to establish and maintain output levels and high prices, each member of the group being allocated a maximum quota; price ring
  4. finance, mainly US
    1. a joint fund organized by security-holders for speculative or manipulative purposes on financial markets
    2. the persons or parties involved in such a combination
  5. any of various billiard games in which the object is to pot all the balls with the cue ball, esp that played with 15 coloured and numbered balls; pocket billiards
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verb (tr)
  1. to combine (investments, money, interests, etc) into a common fund, as for a joint enterprise
  2. commerce to organize a pool of (enterprises)
  3. Australian informal to inform on or incriminate (someone)
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See also pools

Word Origin

C17: from French poule, literally: hen used to signify stakes in a card game, from Medieval Latin pulla hen, from Latin pullus young animal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for reservoir

n.

1680s, "a place where something tends to collect," originally figurative, from French réservoir "storehouse," from Old French reserver "to reserve" (see reserve (n.)). Specific meaning "artificial basin to collect and store a large body of water" is from 1705.

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pool

n.1

"small body of water," Old English pol "small body of water; deep, still place in a river," from West Germanic *pol- (cf. Old Frisian and Middle Low German pol, Dutch poel, Old High German pfuol, German Pfuhl). As a short form of swimming pool it is recorded from 1901. Pool party is from 1965.

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pool

n.2

game similar to billiards, 1848, originally (1690s) a card game played for collective stakes (a "pool"), from French poule "stakes, booty, plunder," literally "hen," from Old French poille "hen, young fowl" (see foal (n.)).

Perhaps the original notion is from jeu de la poule, supposedly a game in which people threw things at a chicken and the player who hit it, won it, which speaks volumes about life in the Middle Ages. The notion behind the word, then, is "playing for money." The connection of "hen" and "stakes" is also present in Spanish polla and Walloon paie.

Meaning "collective stakes" in betting first recorded 1869; sense of "common reservoir of resources" is from 1917. Meaning "group of persons who share duties or skills" is from 1928. From 1933 as short for football pool in wagering. Pool shark is from 1898. The phrase dirty pool "underhanded or unsportsmanlike conduct," especially in politics (1951), seems to belong here now, but the phrase dirty pool of politics, with an image of pool (n.1) is recorded from 1871 and was in use early 20c.

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pool

v.1

"to make a common interest, put things into a pool," 1871, from pool (n.2). Related: Pooled; pooling.

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pool

v.2

of liquid, "to form a pool or pools," 1620s, from pool (n.1).

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Online Etymology Dictionary, © 2010 Douglas Harper

reservoir in Medicine

reservoir

(rĕzər-vwär′, -vwôr′, -vôr′)
n.
  1. A fluid-containing sac or cavity.
  2. An organism or a population that directly or indirectly transmits a pathogen while being virtually immune to its effects.
  3. A large or extra supply; a reserve.
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pool

(pōōl)
n.
  1. A collection of blood in any region of the body due to dilation and retardation of the circulation in capillaries and veins.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

reservoir in Science

reservoir

[rĕzər-vwär′]
  1. A natural or artificial pond or lake used for the storage of water.
  2. An underground mass of rock or sediment that is porous and permeable enough to allow oil or natural gas to accumulate in it.
  3. An organism that is the host for a parasitic pathogen or that directly or indirectly transmits a pathogen to which it is immune.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.