po·lar bear • n. a large white arctic bear (Thalarctos maritimus) that lives mainly on the pack ice. It is a powerful swimmer and feeds chiefly on seals.

polar bear Large, white bear that lives on Arctic coasts and ice floes. It spends most of its time at sea on drifting ice, often swimming for many miles. It preys chiefly on seals and is hunted for fur and meat. Length: 2.3m (7.5ft); weight: to 400kg (900lb). Species Thalarctos maritimus.