thalassic

Of or relating to seas or oceans, especially smaller or inland seas.

In zoology, living in the high seas; pelagic; marine.

Of, pertaining to, or restricted to the smaller bodies of water called seas, as distinguished from oceanic.

Of or pertaining to the sea; — sometimes applied to rocks formed from sediments deposited upon the sea bottom.

of, or relating to seas and oceans

relating to the seas, especially smaller or inland seas