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differentiated product
differentiation
differing
difficult
difficulty
diffident
diffract
diffraction
diffraction grating
diffraction ring
diffractometer
diffuse (1)
diffuse (2)
diffuser
diffusion
diffusion pump
diffusionism
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diffraction grating

dif·frac·tion grat·ing (plural dif·frac·tion grat·ings)


noun 
Definition:
 
polished surface etched with fine lines: a glass plate or metal mirror engraved with a large number of parallel lines or grooves, used to produce a spectrum by diffraction or interference

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