a. [ad. Fr. érugineux, -euse; ad. L. ærūginōs-us rusty, f. ærūgin-em verdigris, f. æs, ær-is, brass.] Of the nature or color of verdigris, or copper-rust.
1605. Timme, Quersit., III. 158. Shal it bee free and permitted to common physitians to cal choler æruginus, vitelline, and proracious?
1651. N. Biggs, New Dispens., § 160. 120. Partake of a canckerous æruginous quality from the brazen vessel.
1721. Bailey, Ærugineous, rusty.
1875. Griffith & Henfrey, Microsc. Dict., s.v. Calothrix, A rare freshwater species … æruginous green, growing blackish.
