A substance of a reddish brown color, and when fresh of the
   consistence of honey, obtained from a bag being behind the navel of the
   male musk deer. It has a slightly bitter taste, but is specially
   remarkable for its powerful and enduring odor. It is used in medicine
   as a stimulant antispasmodic. The term is also applied to secretions of
   various other animals, having a similar odor.