Quer′ci‐tan″nic (kwẽr′sĭ‐tăn″nĭk), a. [L. quercus an oak + E. tannic.] (Chem.) Pertaining to, or designating, a tannic acid found in oak bark and extracted as a yellowish brown amorphous substance.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.