tannin

Noun
  1. Any of various complex phenolic substances of plant origin;
    Used in tanning and in medicine (synset 115091592)
    is a type of: phenol - any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups
    subtypes:
    • cutch, kutch - tannin extract derived from any of several mangrove barks of Pacific areas
    • catechin - a tannic acid that is extracted from black catechu as a white crystalline substance
    same as: tannic acid

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