The Collaborative International Dictionary of English v.0.48:

Grizzly \Griz"zly\, n.; pl. Grizzlies.
   1. (Zool.) A grizzly bear. See under Grizzly, a.
      [1913 Webster]

   2. pl. In hydraulic mining, gratings used to catch and throw
      out large stones from the sluices. [Local, U. S.]
      --Raymond.
      [1913 Webster]