A class of plant compounds containing tannic acids bonded to ellagic acid, found abundantly in berries, pomegranates, and tree bark.
Derived from 'ellagic' plus 'tannin' (from French 'tannin,' from medieval Latin 'tanna,' meaning oak bark). First identified and named by chemists in the 1800s studying plant chemistry.
Ellagitannins are why pomegranate juice stains everything dark red and why old-fashioned tanners used oak bark—these stubborn molecules bind to proteins and create permanent color, the same chemistry that makes medieval manuscripts fade yet still survive centuries!
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