The Collaborative International Dictionary
Eruginous
Eruginous \E*ru"gi*nous\, a. [Cf. F. ['e]rugineux. See [AE]ruginous.] Partaking of the substance or nature of copper, or of the rust of copper; resembling the rust of copper or verdigris; [ae]ruginous.
Wiktionary
eruginous
a. 1 pertaining to the nature or substance of copper 2 resembling the green colour of copper rust