noun
magnetic permeability
Technical term in physics and engineering; refers to the degree of magnetization of a material in response to an applied magnetic field.
鉄は透磁率が高いため、磁気回路によく使われる。
Iron is often used in magnetic circuits because of its high magnetic permeability.
Compound of 透 (penetrate, permeate), 磁 (magnet), and 率 (rate, coefficient). The term is a modern technical coinage for 'magnetic permeability'.