aeruginous

== English == === Alternative forms === eruginous; æruginous (obsolete) === Etymology === Borrowed from Middle French erugineux, from Latin aerūginōsus (“rusty”). === Adjective === aeruginous (comparative more aeruginous, superlative most aeruginous) Pertaining to copper rust; in particular, resembling the (bluish-)greenish colour of copper rust. Synonym: verdigris