Ferrugo

·noun A disease of plants caused by fungi, commonly called the rust, from its resemblance to iron rust in color.

ferrugo
ferrūgo, ĭnis, f. [ferrum; like aerugo from aes], iron-rust (syn.: aerugo, rubigo). I Prop., Plin...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
ferrugo
ferrūgō inis, f ferrum, iron-rust, the color of iron-rust, dark-red, dark-chestnut, dusky color : ...

An Elementary Latin Dictionary