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nucin

nucin Chem.
  (ˈnjuːsɪn)
  [f. L. nuc-, nux nut + -in.]
  A crystalline substance obtained from green walnut-shells.

1885 in Cassell. 1892 Thorpe Dict. Appl. Chem. III. 100 Juglone.., Nucin, Regianin.

Oxford English Dictionary

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