tidemark

tide·mark

[tahyd-mahrk]
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; tide1 + mark1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
tidemark (ˈtaɪdˌmɑːk) [Click for IPA pronunciation guide]
 
n
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.  chiefly (Brit) a mark showing a level reached by a liquid: a tidemark on the bath
4.  informal chiefly (Brit) a dirty mark on the skin, indicating the extent to which someone has washed

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Tidemark is always a great word to know.
So is bezoar. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
American Heritage
Science Dictionary
tidemark   (tīd'märk')  Pronunciation Key 
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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