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.

1800–10; tide1 + -al1

tidally, adverb
nontidal, adjective
untidal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tidal (ˈtaɪdəl)
1.  relating to, characterized by, or affected by tides: a tidal estuary
2.  dependent on the state of the tide: a tidal ferry
3.  (of a glacier) reaching the sea and discharging floes or icebergs

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1807, a hybrid formation from tide (q.v.) + Latin-derived suffix -al. 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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American Heritage
Medical Dictionary

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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Bible Dictionary

Tidal definition

(in the LXX. called "Thorgal"), styled the "king of nations" (Gen.14:1-9). Mentioned as Tudkhula on Arioch's brick (see facing page 139). _Goyyim_, translated "nations," is the country called Gutium, east of Tigris and north of Elam.

Easton's 1897 Bible Dictionary
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Example sentences
He also found that tidal maximums and minimums were growing more extreme year
  by year.
The resourceful and innovative people who lived on the tidal flats had indoor
The show yields an immersive sense of early modern art as a tidal wave of
  hot-and-bothered genius.
Repressive laws may not be enough to stop a tidal wave of straight talk.
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