from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The entire range of radiation extending in frequency from approximately 1023 hertz to 0 hertz or, in corresponding wavelengths, from 10-13 centimeter to infinity and including, in order of decreasing frequency, cosmic-ray photons, gamma rays, x-rays, ultraviolet radiation, visible light, infrared radiation, microwaves, and radio waves.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The entire range of wavelengths of all known electromagnetic radiations extending from gamma rays through visible light, infrared, and radio waves, to X-rays.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the entire frequency range of electromagnetic waves
Sorry, no etymologies found.
Low-level mechs always imagined they could kill with mech weapons, never realizing that organic forms could shut out the electromagnetic spectrum and still function quite independently.