Artificial intelligent assistant

eruginous

eˈruginous, a. Obs.
  [ad. L. ærūginōsus, f. ærūgin-em: see prec.]
  Partaking of the nature or substance of verdigris, or of copper itself; resembling verdigris.

1646 Sir T. Browne Pseud. Ep. vi. xii. 336 Artificiall copperose..is a rough and acrimonious kinde of salt drawn out of ferreous and eruginous earths. 1666 G. Harvey Morb. Angl. (J.), Agues depend..upon an adust stibial or eruginous sulphur.

Oxford English Dictionary

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