A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted, as to supply a fountain, a canal, or a city by means of aqueducts, or to drive a mill wheel, or the like. [1913 Webster]
A small intercellular space, often containing resin, essential oil, or some other secreted matter. [1913 Webster]
a large quantity of infectious microorganisms resident in animals other than man, potentially capable of being transmitted to humans. [PJC]
a large quantity of infectious microorganisms or parasites resident in animals other than man, potentially capable of being transmitted to humans; especially, such organisms in animals where they do little or no harm to the host. [PJC]
a large supply or stock of anything which may be rapidly put to use; a reserve. [PJC]

Receiving reservoir (Water Works), a principal reservoir into which an aqueduct or rising main delivers water, and from which a distributing reservoir draws its supply.

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OXFORD DICTIONARY

reservoir, n.
1 a large natural or artificial lake used as a source of water supply.
2 a any natural or artificial receptacle esp. for or of fluid. b a place where fluid etc. collects.
3 a part of a machine etc. holding fluid.
4 (usu. foll. by of) a reserve or supply esp. of information.

Etymology

F r{eacute}servoir f. r{eacute}server RESERVE

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THESAURUS

reservoir

archives, armory, arsenal, artificial lake, attic, backlog, bank, basement, bay, bayou lake, bin, bonded warehouse, bookcase, box, bunker, buttery, cache, cargo dock, cellar, chest, cistern, closet, conservatory, crate, crib, cupboard, dam, dead water, depository, depot, dike, dock, drawer, dump, etang, exchequer, farm pond, fishpond, freshwater lake, glacial lake, glory hole, godown, hoard, hold, hutch, inland sea, inventory, lagoon, laguna, lake, lakelet, landlocked water, library, linn, loch, locker, lough, lumber room, lumberyard, magasin, magazine, mere, millpond, millpool, nest egg, nyanza, oxbow lake, plash, pond, pondlet, pool, puddle, rack, repertory, repository, reserve, reserve fund, reserve supply, reserves, resource, rick, salina, salt pond, savings, shelf, sinking fund, something in reserve, stack, stack room, stagnant water, standing water, still water, stock, stock room, stockpile, storage, store, storehouse, storeroom, sump, supply base, supply depot, tank, tarn, tidal pond, treasure house, treasure room, treasury, unexpended balance, vat, vault, volcanic lake, warehouse, water hole, water pocket, well, wine cellar

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ROGET THESAURUS

reservoir

Store

N store, stock, fund, mine, vein, lode, quarry, spring, fount, fountain, well, wellspring, milch cow, stock in trade, supply, heap, treasure, reserve, corps de reserve, reserved fund, nest egg, savings, bonne bouche, crop, harvest, mow, vintage, store, accumulation, hoard, rick, stack, lumber, relay, storehouse, storeroom, storecloset, depository, depot, cache, repository, reservatory, repertory, repertorium, promptuary, warehouse, entrepot, magazine, buttery, larder, spence, garner, granary, cannery, safe-deposit vault, stillroom, thesaurus, bank, armory, arsenal, dock, gallery, museum, conservatory, menagery, menagerie, reservoir, cistern, aljibar, tank, pond, mill pond, gasometer, budget, quiver, bandolier, portfolio, coffer, conservation, storing, storage, keep, file (papers), lay in, preserve, Adj, stored, in store, in reserve, in ordinary, spare, supernumerary, adde parvum parvo magnus acervus erit.

Lake

N gulf, lake, land covered with water, gulf, gulph, bay, inlet, bight, estuary, arm of the sea, bayou, fiord, armlet, frith, firth, ostiary, mouth, lagune, lagoon, indraught, cove, creek, natural harbor, roads, strait, narrows, Euripus, sound, belt, gut, kyles, continental slope, continental shelf, lake, loch, lough, mere, tarn, plash, broad, pond, pool, lin, puddle, slab, well, artesian well, standing water, dead water, sheet of water, fish pond, mill pond, ditch, dike, dyke, dam, reservoir, alberca, barachois, hog wallow, lacustrine.

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