POLOCSKI, a town of Lithuania, and capital of a palatinate of the same name, with two castles to defend it. It was taken by the Muscovites in 1563, and retaken the same year. It is seated on the river Dwina, 50 miles south-west of Weytelski, and 80 east of Bredlaw. E. Long. 29. o. N. Lat. 56. 4.