of or pertaining to the littoral region that is above the low-water mark and below the high-water mark.

1880–85; inter- + tidal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intertidal (ˌɪntəˈtaɪdəl)
of or relating to the zone of the shore between the high-water mark and low-water mark

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
intertidal   (ĭn'tər-tīd'l)  Pronunciation Key 
Relating to the region between the high tide mark and the low tide mark.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Mangroves are habitats of enclosed intertidal mud flats with wave action
  greatly reduced, located near sources of fresh water.
Two of the main natural attractions of the island are its mangroves intertidal
  area walks.
The inside of a body, however, poses many of the same challenges as an
  intertidal zone.
Introduced rats indirectly change marine rocky intertidal communities from
  algae- to invertebrate-dominated.
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