[{"Bold_text": "noun", "List Items": ["the phenomenon exhibited by wave fronts that, passing the edge of an opaque body, are modulated, thereby causing a redistribution of energy within the front: it is detectable in light waves by the presence of a pattern of closely spaced dark and light bands diffrac?tion pat?tern at the edge of a shadow.", "the bending of waves, especially sound and light waves, around obstacles in their path."]}]