tanbark
tan.bark \'tan-.ba:rk\ n 1: a bark rich in tannin bruised or cut into small pieces and used in tanni ng 2: a surface (as a circus ring) covered with spent tanbark
Webster's English Dictionarytan.bark \'tan-.ba:rk\ n 1: a bark rich in tannin bruised or cut into small pieces and used in tanni ng 2: a surface (as a circus ring) covered with spent tanbark