cobwebby in WordNet English dictionary

1. covered with cobwebs
   cobwebby 
   
2. 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"
   diaphanous  filmy  gauzy  gauze-like  gossamer  see-through  sheer  transparent  vaporous  vapourous  cobwebby