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Iodine Value. A measure of the degree of unsaturation (q.v.) of a fat (q.v.), as iodine is absorbed on any double bond (q.v.) present in the fat. The amount of iodine absorbed in this fashion, reported in grams (q.v.) of iodine that react with 100 grams of fat, represents the iodine value and provides an indication of the degree of unsaturation of the fat and of its potential resistance to oxidative rancidity (q.v.).