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guaiacin

guaiacin Chem.
  (ˈgwaɪəsɪn)
  Also -ine.
  [f. guaiacum + -in.]
  A non-nitrogenous vegetable principle discovered in the wood and bark of the Guaiacum officinale, having a sharp acrid taste.
  An earlier word guaiacine occurs in Timme's Quersitanus i. xiii. k j b (1605), where ‘salt of guaiacine’ renders the L. sal guaiacinus (app. = guaiacum 2).

1830 Lindley Nat. Syst. Bot. 137 All the Guaiacums..contain a particular matter often designated as resin..but which is now considered a distinct substance, called Guaiacine. 1875 H. C. Wood Therap. (1879) 423 Landerer asserts that he has found in it a peculiar crystallizable substance which he calls guaiacin.

Oxford English Dictionary

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