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The Collaborative International Dictionary of English v.0.48 (gcide)

Tidal \Tid"al\, a.
Of or pertaining to tides; caused by tides; having tides;
periodically rising and falling, or following and ebbing; as,
tidal waters.
[1913 Webster]

The tidal wave of deeper souls
Into our inmost being rolls,
And lifts us unawares
Out of all meaner cares. --Longfellow.
[1913 Webster]

{Tidal air} (Physiol.), the air which passes in and out of
the lungs in ordinary breathing. It varies from twenty to
thirty cubic inches.

{Tidal basin}, a dock that is filled at the rising of the
tide.

{Tidal wave}.
(a) See {Tide wave}, under {Tide}. Cf. 4th {Bore}.
(b) A vast, swift wave caused by an earthquake or some
extraordinary combination of natural causes. It rises far
above high-water mark and is often very destructive upon
low-lying coasts.
[1913 Webster]