D defs.my
Entry 1 sense Webster, 1913

Tidal

/tīd-(ə)l/ · Tid·al · IPA /ˈtaɪ.d(ə)l/
01 a. Of or pertaining to tides; caused by tides; having tides; periodically rising and falling, or following and ebbing; as, tidal waters.
  1. 1.
    Of or pertaining to tides; caused by tides; having tides; periodically rising and falling, or following and ebbing; as, tidal waters.
    “The tidal wave of deeper souls Into our inmost being rolls, And lifts us unawares Out of all meaner cares.” Longfellow.
Phrases & compounds
Tidal air — 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 — See Tide wave, under Tide. Cf. 4th Bore.