Filmy

Adjective:
1. So thin as to transmit light

Usage:
1. Filmy wings of a moth

Synonyms:
1. Cobwebby
2. Diaphanous
3. Gauze-Like
4. Gauzy
5. Gossamer
6. See-Through
7. Sheer
8. Transparent
9. Vaporous
10. Vapory