noun
: a theoretical layer or shell so magnetized that one surface is entirely of north and the other of south polarity with the lines of induction extending through the thickness of the layer
noun
: a theoretical layer or shell so magnetized that one surface is entirely of north and the other of south polarity with the lines of induction extending through the thickness of the layer
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012