tidal flat


noun

tideland that is flat or nearly flat and often muddy or marshy.

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Scientific definitions for tidal flat

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.