Source : Webster's Revised Unabridged Dictionary (1913)

Cobwebby \Cob"web`by\, a.
   Abounding in cobwebs, or any fine web; resembling a cobweb.

Source : WordNet®

cobwebby
     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: {diaphanous}, {filmy}, {gauzy}, {gossamer}, {see-through},
            {sheer}, {transparent}, {vaporous}]