of or pertaining to seas and oceans.
of or pertaining to smaller bodies of water, as seas and gulfs, as distinguished from large oceanic bodies.
growing, living, or found in the sea; marine.

1855–60; < Greek thálass(a) sea + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thalassic (θəˈlæsɪk)
1.  of or relating to the sea
2.  of or relating to small or inland seas, as opposed to open waters
3.  inhabiting or growing in the sea; marine: thalassic fauna
[C19: from French thalassique, from Greek thalassa sea]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
thalassic   (thə-lās'ĭk)  Pronunciation Key 
  1. Relating to seas or oceans, especially smaller or inland seas.

  2. Relating to rocks formed from sediment that has been deposited on the ocean floor.

The American Heritage® Science Dictionary
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