Is ‘thalassic’ a Scrabble US Word? Yes
Is ‘thalassic’ a Scrabble UK Word? Yes
Is ‘thalassic’ a Words With Friends Word? Yes
Is ‘thalassic’ an Adjective? Yes
Is ‘thalassic’ an Adverb? No
Is ‘thalassic’ a Noun? No
Is ‘thalassic’ a Verb? No
relating to the seas, especially smaller or inland seas;
- Scientific American;
"deposits of sediment in gulfs and seas rather than in the ocean proper are known as thalassic deposits"

See also: Words That Rhyme With THALASSIC →