The Collaborative International Dictionary of English v.0.48:

Rhino \Rhi*no\, n. [Etymol. uncertain.]
   Gold and silver, or money. [Cant] --W. Wagstaffe.
   [1913 Webster]

         As long as the rhino lasted.             --Marryat.
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The Collaborative International Dictionary of English v.0.48:

Rhino- \Rhi"no-\
   A combining form from Greek ??, ???, the nose, as in
   rhinolith, rhinology.
   [1913 Webster] Rhinocerial