Source : Webster's Revised Unabridged Dictionary (1913)

Diaphanous \Di*aph"a*nous\, a. [Gr. ?, fr. ? to show or shine
   through; dia` through + ? to show, and in the passive, to
   shine: cf. F. diaphane. See {Phantom}, and cf. {Diaphane},
   {Diaphanic}.]
   Allowing light to pass through, as porcelain; translucent or
   transparent; pellucid; clear.

         Another cloud in the region of them, light enough to be
         fantastic and diaphanous.                --Landor.

Source : WordNet®

diaphanous
     adj : so thin as to transmit light; "a hat with a diaphanous
           veil"; "filmy wings of a moth"; "gauzy clouds of
           dandelion down"; "gossamer cobwebs"; "sheer silk
           stockings"; "transparent chiffon"; "vaporous silks"
           [syn: {filmy}, {gauzy}, {gossamer}, {see-through}, {sheer},
            {transparent}, {vaporous}, {cobwebby}]