From Frankish *fōdar (sheath, lining) via Old French — originally garment lining, then the animal skin used for it.
The short fine hair of certain animals; animal skin with such hair.
From Old French 'forrer' (to line a garment), from Frankish *fōdar (sheath), from Proto-Germanic *fōdrą. Originally meant garment lining — the material happened to be animal skin. Key roots: *fōdrą (Proto-Germanic: "sheath, case").