salt marsh

noun
a marshy tract that is wet with salt water or flooded by the sea.

Origin:
before 1000; Middle English saltmerche, Old English sealtne mersc

salt-marsh, saltmarsh, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
salt marsh
 
n
an area of marshy ground that is intermittently inundated with salt water or that retains pools or rivulets of salt or brackish water, together with its characteristic halophytic vegetation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
salt marsh  
A marsh in which the water is saline, especially a coastal wetland that has halophyte vegetation and is regularly flooded at high tide. Coastal salt marshes help to preserve the shoreline by accommodating storm tides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

salt marsh

area of low, flat, poorly drained ground that is subject to daily or occasional flooding by salt water or brackish water and that is covered with a thick mat of grasses and such grasslike plants as sedges and rushes. Salt marshes are common along low seacoasts, inside barrier bars and beaches, in estuaries, and on deltas and are also extensive in deserts and other arid regions that are subject to occasional overflow by water containing a high content of salts. Maritime salt marshes often extend many miles inland and are variably subject to tidal action; inland brackish marshes are found frequently on mineral substrates of alluvial and lacustrine origin

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The brook's mouth was a convenient salt marsh, where the colonists could anchor
  their boats.
In this lesson, students will learn about and act out the functions of the salt
  marsh habitat.
Today it is a protected beach and salt marsh, scattered with sun-bleached
  driftwood and taiga woodlands.
Many kinds of animals, from mosquitoes to stilt-legged egrets, make up the salt
  marsh ecosystem.
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