Source : Webster's Revised Unabridged Dictionary (1913)

Grainy \Grain"y\, a.
   Resembling grains; granular.

Source : WordNet®

grainy
     adj : composed of or covered with relatively large particles;
           "granular sugar"; "gritty sand" [syn: {farinaceous}, {coarse-grained},
            {granular}, {granulose}, {gritty}, {mealy}, {sandy}]
     [also: {grainiest}, {grainier}]