tha·las·sic /θəˈlæsɪk/
  (a.)海的,海灣的,內海的
  Tha·las·sic a.  Geol. Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.
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  thalassic
       adj : relating to the seas, especially smaller or inland seas;
             "deposits of sediment in gulfs and seas rather than in
             the ocean proper are known as thalassic deposits"-
             Scientific American