| NOUN | artifact | diffraction grating, grating | optical device consisting of a surface with many parallel grooves in it |
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| Meaning | 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. | |
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| Synonym | grating | |
| Narrower | echelon | A diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset |
| Broader | optical device | A device for producing or controlling light |
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