DIFFRACTION
\dɪfɹˈakʃən], \dɪfɹˈakʃən], \d_ɪ_f_ɹ_ˈa_k_ʃ_ə_n]\
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The turning aside of a ray of light when passing the edge of a body that will not admit light; the change suffered by such a ray.
By William Dodge Lewis, Edgar Arthur Singer
By William R. Warner