A grill or network of bars set in a window or door or used as a partition; a grate.(noun)
A diffraction grating.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "grating" in a sentence
"My advice, as usual when it comes to grating, is to get yourself a microplane, the one with the smallest gauge (from any half-decent kitchen shop)."
"A further main advantage of Rowland's grating is that it is now no longer scratched on plane surfaces, but on spherical concave surfaces with a radius of say 3 metres, so that real images are produced of luminous lines without the need for the insertion of lenses."
"It is, no doubt, troublesome to make the oil so frequently, for the grating is tedious, and it must be slowly boiled; still, Kobez was not so oppressed by many duties that he could not find time to make it himself."