ru·big·i·nous 
(r-bĭjə-nəs) also ru·big·i·nose (-nōs′)
(r-bĭjə-nəs) also ru·big·i·nose (-nōs′)adj.
Rust-colored; reddish-brown.
[Latin rūbīginōsus, from rūbīgō, rūbīgin-, rust, from rōbus, red; see reudh- in the Appendix of Indo-European roots.]