English word magnetoptical comes from English optical, English magnet- (Magnet, magnetic, magnetism.)

Detailed word origin of magnetoptical

Dictionary entry	Language	Definition
optical	English (eng)	Designed to assist or enhance sight. Incorporating light-sensitive devices. Of, or relating to optics. Of, or relating to sight; visual. Of, or relating to visible light.
magnet-	English (eng)	Magnet, magnetic, magnetism.
magnetoptical	English (eng)

Words with the same origin as magnetoptical