[grey-ting] 
| 1. | a fixed frame of bars or the like covering an opening to exclude persons, animals, coarse material, or objects while admitting light, air, or fine material. |
| 2. | Physics. diffraction grating. |
[greyt] noun, verb, grat⋅ed, grat⋅ing.| 1. | a frame of metal bars for holding fuel when burning, as in a fireplace, furnace, or stove. |
| 2. | a framework of parallel or crossed bars, used as a partition, guard, cover, or the like; grating. |
| 3. | a fireplace. |
| 4. | to furnish with a grate or grates. |
[greyt] verb, grat⋅ed, grat⋅ing.| 1. | to have an irritating or unpleasant effect: His constant chatter grates on my nerves. |
| 2. | to make a sound of, or as if of, rough scraping; rasp. |
| 3. | to sound harshly; jar: to grate on the ear. |
| 4. | to scrape or rub with rough or noisy friction, as one thing on or against another. |
| 5. | to reduce to small particles by rubbing against a rough surface or a surface with many sharp-edged openings: to grate a carrot. |
| 6. | to rub together with a harsh, jarring sound: to grate one's teeth. |
| 7. | to irritate or annoy. |
| 8. | Archaic. to wear down or away by rough friction. |
| a band of equidistant, parallel lines, usually more than 5000 per inch (2000 per centimeter), ruled on a glass or polished metal surface for diffracting light to produce optical spectra. |
| grate 1 (grāt) v. grat·ed, grat·ing, grates v. tr.
[Middle English graten, from Old French grater, to scrape, of Germanic origin.] |
| grate 2 (grāt) n.
To equip with a grate. [Middle English, from Medieval Latin grāta, alteration of Latin crātis, wickerwork.] |
| grat·ing (grā'tĭng) n.
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