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• n  (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation

• According to a 2006 study published in the Journal of Agricultural and Food Chemistry, Acai boasts an ORAC (oxygen radical absorbance capacity) score more than 10 times as high as well-known antioxidant-rich foods like cranberries.
• ORAC levels describes the Oxygen Radical Absorbance Capacity of food based antioxidants, which is an indicator of total antioxidant capacity. 

• optical density
• transmission density
• photographic density

News & Articles

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• Microspectrophotometer automatically analyzes samples.
  Fully programmable with touchscreen controls, 20/30 PV™ images and measures sub-micron sized samples by absorbance, reflectance, fluorescence, and emission from deep ultraviolet to near infrared. Automated system integrates Lightblades™ spectrophotometer technologies with custom built UV-visible-NIR microscope and software. Applications include contamination analysis of hard disk ...
  Aug. 5, 2013 - ThomasNet