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n. (used with a sing. verb)
The branch of physics that deals with phenomena associated with magnetic effects on matter as it emits light, having applications in computer data-storage and waveguides.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.