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riv·er  (rvr)
1. Abbr. R. A large natural stream of water emptying into an ocean, lake, or other body of water and usually fed along its course by converging tributaries.
2. A stream or abundant flow: a river of tears.
up the river Slang
In or into prison.

[Middle English rivere, from Anglo-Norman, from Vulgar Latin *rpria, from Latin, feminine of rprius, of a bank, from rpa, bank.]

river [ˈrɪvə]
1. (Earth Sciences / Physical Geography)
a.  a large natural stream of fresh water flowing along a definite course, usually into the sea, being fed by tributary streams
b.  (as modifier) river traffic a river basin
c.  (in combination) riverside riverbed Related adjs fluvial, potamic
2. any abundant stream or flow a river of blood
sell down the river Informal to deceive or betray
[from Old French riviere, from Latin rīpārius of a river bank, from rīpa bank]
riverless  adj

river  (rvr)
A wide, natural stream of fresh water that flows into an ocean or other large body of water and is usually fed by smaller streams, called tributaries, that enter it along its course. A river and its tributaries form a drainage basin, or watershed, that collects the runoff throughout the region and channels it along with erosional sediments toward the river. The sediments are typically deposited most heavily along the rivers lower course, forming floodplains along its banks and a delta at its mouth.

river  /rvr/  n. 1 a large body of water that moves in one direction between two river banks: The Nile and the Mississippi are among the largest rivers in the world. 2 fig. a great deal of some liquid: The war caused a river of blood. river

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