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differentiation
differing
difficult
difficulty
diffident
diffract
diffraction
diffraction grating
diffraction ring
diffractometer
diffuse (1)
diffuse (2)
diffuser
diffusion
diffusion pump
diffusionism
diffusive
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diffraction ring
dif·frac·tion ring (plural dif·frac·tion rings)


noun 
Definition:
 
pattern of light: a circular pattern of light that surrounds a particle under a microscope, resulting from diffraction
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