from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The branch of physics that deals with phenomena associated with magnetic effects on matter as it emits light. It has been used to develop a data-storage technique in computer applications.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the branch of physics which deals with the influence of a magnetic field on optical phenomena
magneto- + optics (Wiktionary)