Source : Webster's Revised Unabridged Dictionary (1913)

Translucence \Trans*lu"cence\, Translucency \Trans*lu"cen*cy\,
   n.
   The quality or state of being translucent; clearness; partial
   transparency. --Sir T. Browne.

Source : WordNet®

translucency
     n : the quality of allowing light to pass diffusely [syn: {translucence},
          {semitransparency}]