The Collaborative International Dictionary of English v.0.48:
Tidal \Tid"al\, a.
Of or pertaining to tides; caused by tides; having tides;
periodically rising and falling, or following and ebbing; as,
The tidal wave of deeper souls
Into our inmost being rolls,
And lifts us unawares
Out of all meaner cares. --Longfellow.
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
(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
WordNet (r) 3.0 (2006):
n 1: a basin that is full of water at high tide