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tidemark

[tahyd-mahrk] /ˈtaɪdˌmɑrk/
noun
1.
the point that something or someone has reached, receded below, or risen above:
He has reached the tidemark of his prosperity.
2.
a mark left by the highest or lowest point of a tide.
3.
a mark made to indicate the highest or lowest point of a tide.
Origin
1790-1800
1790-1800; tide1 + mark1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for tidemark

tidemark

/ˈtaɪdˌmɑːk/
noun
1.
a mark left by the highest or lowest point of a tide
2.
a marker indicating the highest or lowest point reached by a tide
3.
(mainly Brit) a mark showing a level reached by a liquid: a tidemark on the bath
4.
(informal, mainly Brit) a dirty mark on the skin, indicating the extent to which someone has washed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tidemark in Science
tidemark
  (tīd'märk')   
A line or mark on a shore indicating the highest or lowest level reached by the tide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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