Source : Webster's Revised Unabridged Dictionary (1913)

Grizzly \Griz"zly\, a.
   Somewhat gray; grizzled.

         Old squirrels that turn grizzly.         --Bacon.

   {Grizzly bear} (Zo["o]l.), a large and ferocious bear ({Ursus
      horribilis}) of Western North America and the Rocky
      Mountains. It is remarkable for the great length of its
      claws.

Grizzly \Griz"zly\, n.; pl. {Grizzlies}.
   1. (Zo["o]l.) A grizzly bear. See under {Grizzly}, a.

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

Source : WordNet®

grizzly
     adj : showing characteristics of age, especially having gray or
           white hair; "whose beard with age is hoar"-Coleridge;
           "nodded his hoary head" [syn: {gray}, {grey}, {gray-haired},
            {grey-haired}, {gray-headed}, {grey-headed}, {hoar}, {hoary},
            {white-haired}]
     [also: {grizzliest}, {grizzlier}]

grizzly
     n : powerful brownish-yellow bear of the uplands of western
         North America [syn: {grizzly bear}, {silvertip}, {silver-tip},
          {Ursus horribilis}, {Ursus arctos horribilis}]
     [also: {grizzliest}, {grizzlier}]