ferromagnetic

a. 铁磁体
【医】 磁性铁的

名词:ferromagnetism 

fer.ro.mag.net.ic

adj.（形容词）
Relating to or characteristic of substances such as iron, nickel, or cobalt and various alloys that exhibit extremely high magnetic permeability, the ability to acquire high magnetization in relatively weak magnetic fields, a characteristic saturation point, and magnetic hysteresis.
铁磁的：具有类似铁、镍或钴以及各种合金性质的或与此类物质有关的，具有在相对较弱的磁场里获得极高磁性的能力和特有的饱和点及磁滞现象

【引伸】
fer.romag.netism