The American Heritage® Dictionary of the English Language, 4th Edition
n. A natural compound found in grapes, mulberries, peanuts, and other plants or food products, especially red wine, that may protect against cancer and cardiovascular disease by acting as an antioxidant, antimutagen, and anti-inflammatory.
n. A phenolic substance, 3,5,4'-trihydroxystilbene, that occurs in some fruits, nuts and in red wine, that has antioxidant and other beneficial properties.
Word Usage
"But researchers have had mixed success in recreating the original experiments showing both that sirtuins can extend life, and that they can be "activated" by a substance called resveratrol, which is currently found in anti-aging creams and under investigation for ailments associated with old age."