POCOSIN Meaning of POCOSIN in English /peuh koh"seuhn, poh"keuh seuhn/ , n. Southeastern U.S.a swamp or marsh in an upland coastal region. Also, pocoson, pocosen . [ 1625-35, Amer.; prob. ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012