IPA: /ˌfɛrəʊˈmæɡnɪzəm/
KK: /ˌfɛrəʊˈmæɡnɪzəm/
The process in which some materials can become permanent magnets when they are exposed to a magnetic field.
Iron exhibits ferromagnetism, allowing it to become a magnet when near a magnetic field.
Ferromagnetism is formed from "ferro-" (from Latin "ferrum", meaning iron) and "magnetism" (from Greek "magnetis", meaning related to magnet). The term describes the magnetic properties of materials, particularly iron, that can become magnetized and retain their magnetism.
Think of 'iron' ('ferro-') and its special ability to become 'magnetized' ('magnetism') — that's what ferromagnetism refers to.