from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A usually glass or polished metal surface having a large number of very fine parallel grooves or slits and used to produce optical spectra by diffraction of reflected or transmitted light.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a surface having a large number of closely spaced lines or slits; used to produce optical spectra by mutual interference
from the GNU version of the Collaborative International Dictionary of English
- n. See under Grating.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum
Sorry, no etymologies found.