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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.
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)
verb (used without object)
7.
to form a pool.
8.
(of blood) to accumulate in a body part or organ.
verb (used with object)
9.
to cause pools to form in.
10.
to cause (blood) to form pools.
adjective
11.
of or for a pool:
pool filters.
12.
taking place or occurring around or near a pool:
a pool party.
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; reserve: a reservoir of talent
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; puddle: a 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
noun
1.
any communal combination of resources, funds, etc: a 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)

a joint fund organized by security-holders for speculative or manipulative purposes on financial markets
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
verb (transitive)
6.
to combine (investments, money, interests, etc) into a common fund, as for a joint enterprise
7.
(commerce) to organize a pool of (enterprises)
8.
(Austral, informal) to inform on or incriminate (someone)

reservoir res·er·voir (rěz’ər-vwär’, -vwôr’, -vôr’)
n.

A fluid-containing sac or cavity.

An organism or a population that directly or indirectly transmits a pathogen while being virtually immune to its effects.

A large or extra supply; a reserve.

pool (pōōl)
n.
A collection of blood in any region of the body due to dilation and retardation of the circulation in capillaries and veins.
reservoir
(rěz’ər-vwär’)

A natural or artificial pond or lake used for the storage of water.

An underground mass of rock or sediment that is porous and permeable enough to allow oil or natural gas to accumulate in it.

An organism that is the host for a parasitic pathogen or that directly or indirectly transmits a pathogen to which it is immune.

pool

a pond, or reservoir, for holding water (Heb. berekhah; modern Arabic, birket), an artificial cistern or tank. Mention is made of the pool of Gibeon (2 Sam. 2:13); the pool of Hebron (4:12); the upper pool at Jerusalem (2 Kings 18:17; 20:20); the pool of Samaria (1 Kings 22:38); the king’s pool (Neh. 2:14); the pool of Siloah (Neh. 3:15; Eccles. 2:6); the fishpools of Heshbon (Cant. 7:4); the “lower pool,” and the “old pool” (Isa. 22:9,11). The “pool of Bethesda” (John 5:2,4, 7) and the “pool of Siloam” (John 9:7, 11) are also mentioned. Isaiah (35:7) says, “The parched ground shall become a pool.” This is rendered in the Revised Version “glowing sand,” etc. (marg., “the mirage,” etc.). The Arabs call the mirage “serab,” plainly the same as the Hebrew word _sarab_, here rendered “parched ground.” “The mirage shall become a pool”, i.e., the mock-lake of the burning desert shall become a real lake, “the pledge of refreshment and joy.” The “pools” spoken of in Isa. 14:23 are the marshes caused by the ruin of the canals of the Euphrates in the neighbourhood of Babylon. The cisterns or pools of the Holy City are for the most part excavations beneath the surface. Such are the vast cisterns in the temple hill that have recently been discovered by the engineers of the Palestine Exploration Fund. These underground caverns are about thirty-five in number, and are capable of storing about ten million gallons of water. They are connected with one another by passages and tunnels.