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[tahyd-l] /ˈtaɪd l/
of, pertaining to, characterized by, or subject to tides:
a tidal current.
dependent on the state of the tide as to time of departure:
a tidal steamer.
Origin of tidal
First recorded in 1800-10; tide1 + -al1
Related forms
tidally, adverb
nontidal, adjective
untidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for tidal
Contemporary Examples
Historical Examples
  • I had missed the tidal train, and I represented that this had caused me some inconvenience.

    Recollections David Christie Murray
  • The tidal wave of progress, once repulsed, is not likely to subside forever.

    The Arena Various
  • He sat, vaguely hoping there might be tidal waves, earthquakes, cataclysms.

    Erik Dorn

    Ben Hecht
  • A great Peruvian earthquake sent a tidal wave into the Red Sea.

  • Carried by the tidal rush the old tub circled in a great ellipse.

    Terry Charles Goff Thomson
British Dictionary definitions for tidal


relating to, characterized by, or affected by tides: a tidal estuary
dependent on the state of the tide: a tidal ferry
(of a glacier) reaching the sea and discharging floes or icebergs
Derived Forms
tidally, adverb
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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Word Origin and History for tidal

1807, a hybrid formation from tide (n.) + Latin-derived suffix -al (1). A tidal wave (1830) is properly high water caused by movements of the tides; erroneous use for "tsunami, great ocean wave caused by an earthquake, etc." is recorded from 1878.

Online Etymology Dictionary, © 2010 Douglas Harper
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tidal in Medicine

tidal tid·al (tīd'l)
Resembling the tides; alternately rising and falling.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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