diaphanous

adjective3

1. •
   Transparent or translucent; allowing light to pass through; capable of being seen through.

   • Adam requires a touch of feminine lace and a whisper of diaphanous silk, not a direct vision of the gaping maw of the human vulva. — 1981
2. •
   Of a fine, almost transparent, texture; gossamer; light and insubstantial.

   • The most diaphanous wings carry a burden of pollen from flower to flower. — 1951
3. •
   Isorefractive, having an identical refractive index.