Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A pulse of intense electromagnetic radiation generated by certain physical events, especially by a nuclear explosion. The pulse includes a continuous spectrum of low frequencies and can interfere with the operation of electrical equipment.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.