OUTWASH Meaning of OUTWASH in English /owt"wosh', -wawsh'/ , n. Geol.the material, chiefly sand or gravel, deposited by meltwater streams in front of a glacier. [ 1890-95; OUT- + WASH ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012