Etymology
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tidal (adj.)

1807, a hybrid formation from tide (n.) + Latin-derived suffix -al (1). A tidal wave (1819) properly is high water caused by movements of the tides; erroneous use for "tsunami, great ocean wave caused by an earthquake, etc." is recorded from 1868.

updated on February 09, 2014

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Definitions of tidal from WordNet

tidal (adj.)
of or relating to or caused by tides;
tidal wave
From wordnet.princeton.edu, not affiliated with etymonline.