thalassic
Adjective
Meaning
Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.
Source: Webster's dictionarySynonyms
marine
oceanic
littoral
water
sea
hydrographic
naval
maritime
aquatic
nautical
seafaring
seagoing
deep-sea
pelagic
saltwater
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Antonyms
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deposits of sediment in gulfs and seas rather than in the ocean proper are known as thalassic deposits