grate, grating -- (a barrier that has parallel or crossed bars blocking a passage but admitting air)
grate, grating -- (a frame of iron bars to hold a fire)
diffraction grating, grating -- (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)
Overview of verb grate
The verb grate has 5 senses
grate -- (furnish with a grate; "a grated fireplace")
eat into, fret, rankle, grate -- (gnaw into; make resentful or angry; "The injustice rankled her"; "his resentment festered")
grate -- (reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface; "grate carrots and onions"; "grate nutmeg")
grate, grind -- (make a grating or grinding sound by rubbing together; "grate one's teeth in anger")
scrape, grate -- (scratch repeatedly; "The cat scraped at the armchair")