from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Electromagnetic radiation having a wavelength approximately between 1 micrometre and 1 millimetre; perceived as heat.
from the GNU version of the Collaborative International Dictionary of English
- n. electromagnetic radiation having a wavelength of between 700 nanometers and 1 millimeter.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
Sorry, no etymologies found.