Opacity is the quality of being opaque or not allowing light to pass through. In broader use, it also refers to something that is hard to understand or not transparent, whether physically or metaphorically. The term often appears in science, design, and evaluative discourse to denote concealment or lack of clarity.
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0:56Oblique
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0:59Occipital
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1:00Opacity
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1:12Osteomyelitis
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1:11Osteoporosis
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1:00Pancreas
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1:00Parenchyma
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1:00Parietal
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0:56Parotid
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1:10Pelvis
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