Source : Webster's Revised Unabridged Dictionary (1913)

Moss-grown \Moss"-grown`\, a.
   Overgrown with moss.

Source : WordNet®

moss-grown
     adj 1: overgrown with moss [syn: {mossy}]
     2: (used pejoratively) out of fashion; old fashioned;
        "moss-grown ideas about family life" [syn: {fogyish}, {mossy},
         {stick-in-the-mud(p)}, {stodgy}]