1) Bark 2) Bark rich in tannin 3) Cover for the circus ring 4) Kind of beetle or oak 5) Surface under the big top 
Tanbark is the bark of certain species of tree. It is traditionally used for tanning hides. The words `tanning`, `tan,` and `tawny` are derived from the Medieval Latin tannare, `to convert into leather.` Bark mills are horse- or oxen-driven or water powered edge mills and were used in earlier times to shred the tanbark to derive tannins fo...
[n] - bark rich in tannin
noun bark rich in tannin; bruised and cut in pieces to use for tanning; spent tanbark used as a ground covering