blubber (BLUH-buhr) noun. thick layer of fat under the skin of marine mammals.   Blubber covers the entire body of animals such as seals, whales, manatees, and walruses—except for their fins, flippers, and flukes. Blubber an important part of a marine mammal’s anatomy. It stores energy, insulates heat, and increases buoyancy. Blubber is different than most types of fat. Blubber is much thicker and contains … Continue reading Word of the Week: blubber