1historical Specifically. A native or inhabitant of eastern Germany or the Baltic coasts, especially a citizen of the Hanse towns.
2historical, archaic Generally. A native or inhabitant of an eastern country or district. Formerly also: †a member of the Eastern Orthodox Church.
3British historical, dialect Either of two small ducks that occur in southern and eastern Britain chiefly as winter visitors, the wigeon (Anas penelope) and the smew (Mergus albellus).
Late Middle English. From easter + -ling, after either Middle Low German ōsterlinc person from the east, especially a German from one of the more easterly German territories, a Hanse, or Middle Dutch oosterling person from the east, person from northern Germany, a Hanse.