DCHP-1 Online
bossbone 
n. any one of several vertebrae forming the boss of the buffalo, used by the Indians for a number of purposes.
- 1890 A fluffy or wool-like surface was given to the [buffalo] pelt by rubbing it with a boss-bone or rough stone.
- 1890 A fluffy or wool-like surface was given to the [buffalo] pelt by rubbing it with a boss-bone or rough stone.