estuary

[es-choo-er-ee]
noun, plural estuaries.
1.
that part of the mouth or lower course of a river in which the river's current meets the sea's tide.
2.
an arm or inlet of the sea at the lower end of a river.

Origin:
1530–40; < Latin aestuārium channel, creek, inlet, equivalent to aestu(s) tide + -ārium -ary

estuarial [es-choo-air-ee-uhl] , adjective

delta, estuary.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
estuary (ˈɛstjʊərɪ)
 
n , pl -aries
1.  the widening channel of a river where it nears the sea, with a mixing of fresh water and salt (tidal) water
2.  an inlet of the sea
 
[C16: from Latin aestuārium marsh, channel, from aestus tide, billowing movement, related to aestās summer]
 
estuarial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

estuary
1530s, from L. aestuarium "a tidal marsh or opening," from aestus "boiling (of the sea), tide, heat." Related: Estuaries; estuarine.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
estuary   (ěs'ch-ěr'ē)  Pronunciation Key 
  1. The wide lower course of a river where it flows into the sea. Estuaries experience tidal flows and their water is a changing mixture of fresh and salt.

  2. An arm of the sea that extends inland to meet the mouth of a river.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
estuary [(es-chooh-er-ee)]

A wide body of water formed where a large river meets the sea. It contains both fresh and salt water.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The accident occurred near midnight on Wednesday near the estuary of the port
  channel.
As soon as we entered the estuary of the Plata, the weather was very unsettled.
The more fresh water is pumped out, the more sea water flows in to the estuary.
The spill affected the inner harbor and a nearby estuary.
Synonyms
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