UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈtænɪk/US:USA pronunciation: respellingUSA pronunciation: respelling(tanik)

WordReference Random House Unabridged Dictionary of American English © 2020
tan•nic  (tanik),USA pronunciation adj. 
  1. Chemistryof, pertaining to, or derived from tan or tannin.
  2. Wine(of wine) having an astringent taste imparted by the presence of tannin.
  • tan1 or tann(in) + -ic 1825–35

Collins Concise English Dictionary © HarperCollins Publishers::
tannic /ˈtænɪk/ adj
  1. of, relating to, containing, or produced from tan, tannin, or tannic acid
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