russa is a Quenya adjective which means "red-haired" or "russet".
 See also
The word russa represents the color called "russet" in English, which derives from the Latin word russus "red". Although we can't know if the similarities between the Quenya word and russet/russus were intentional by Tolkien, it is possible that they are.
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, Part Three: "The Etymologies", p. 385