† ˈthannic,a.Chem.Obs. [f.Thann (name of a town in the Vosges where Kestner the discoverer lived) + -ic.] In thannic acid: see quot. 1853Pharmac. Jrnl. XIII. 110 Racemic acid was..discovered by Kestner,..in the year 1820. It was called thannic acid by its discoverer.