/ (ˈɔːræk) /
n acronym for
Oxygen Radical Absorbance Capacity: a measure of the ability of a substance, esp the blood, to absorb free radicals, used in determining the antioxidant effects of foods
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for orac
As Orac notes, it is a very least a failure of due diligence.