Below are possible answers for the crossword clue Tannin source.
6 letter answer(s) to tannin source
ACACIA
any of various spiny trees or shrubs of the genus Acacia
Australia's national floral emblem is the golden wattle (Acacia pycnantha Benth). When in flower, the golden wattle displays the national colours, green and gold.
5 letter answer(s) to tannin source
SUMAC
a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus)
Spice used in Middle eastern cuisine made from dried fruits of the Sumac plants
wood of a sumac
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