Source : Webster's Revised Unabridged Dictionary (1913)

Pellucidity \Pel`lu*cid"i*ty\, Pellucidness \Pel*lu"cid*ness\,
   n. [L. pelluciditas.]
   The quality or state of being pellucid; transparency;
   translucency; clearness; as, the pellucidity of the air.
   --Locke.

Source : WordNet®

pellucidity
     n 1: free from obscurity and easy to understand; the
          comprehensibility of clear expression [syn: {clarity}, {lucidity},
           {clearness}, {limpidity}] [ant: {unclearness}, {obscureness}]
     2: passing light without diffusion or distortion [syn: {pellucidness},
         {limpidity}]