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tidal flat

tideland that is flat or nearly flat and often muddy or marshy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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tidal-flat in Science
tidal flat  
A nearly flat coastal area that is alternately covered and exposed by tides and consisting of unconsolidated sediments and precipitated salts. A tidal flat is the middle part of a tidal basin, below the vegetation-supporting salt marsh and the low-tide mark.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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