[ae]ruginous

from The Collaborative International Dictionary of English v.0.48

AEruginous \[AE]*ru"gi*nous\, a. [L. aeruginosus, fr. aerugo
   rust of copper, fr. aes copper: cf. F. ['e]rugineux.]
   Of the nature or color of verdigris, or the rust of copper.
   [1913 Webster]