rubiginose
/ruːˈbɪdʒɪnəʊz/ /rʊˈbɪdʒɪnəʊz/ /ruːˈbɪdʒɪnəʊs/Botany and Zoology
adjective
Rust-coloured; rubiginous.
Origin
Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From classical Latin rūbīgin-, rūbīgō rust, blight + -ose.