diaphonous

Adjective

diaphanous (comparative more diaphanous, superlative most diaphanous)

1. Transparent or translucent; allowing light to pass through; capable of being seen through.
   • The water shone pacifically; the sky, without a speck, was a benign immensity of unstained light; the very mist on the Essex marsh was like a gauzy and radiant fabric, hung from the wooded rises inland, and draping the low shores in diaphanous folds.1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], →OCLC, part I

   Synonyms:

   translucent, transparent, see-through, sheer

   Antonyms:

   opaque

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   • The most diaphanous wings carry a burden of pollen from flower to flower.1951, Robert Frost, Unpublished preface to a collection, 2007, Mark Richardson (editor), The Collected Prose of Robert Frost, page 169

   Synonyms:

   delicate, insubstantial, sheer

   Antonyms:

   concrete, solid

3. Isorefractive, having an identical refractive index.