Quick definitions from WordNet (bone oil)
▸ noun: dark-colored ill-smelling oil obtained by carbonizing bone; used especially in sheep dips and in denaturing alcohol
▸ noun: the liquid portion of bone fat; used as a lubricant and in leather manufacture
▸ noun: dark-colored ill-smelling oil obtained by carbonizing bone; used especially in sheep dips and in denaturing alcohol
▸ noun: the liquid portion of bone fat; used as a lubricant and in leather manufacture