very sheer and light; almost completely transparent or translucent.
2.
delicately hazy.
Origin: 1605–15; < Medieval Latindiaphanus < Greekdiaphan(ḗs) transparent (equivalent to diaphan-, stem of diaphaínein to show through (see dia-, -phane) + -ēs adj. suffix) + -ous
1614, from M.L. diaphanus, from Gk. diaphanes, from dia- "through" + phainesthai, middle voice form (subject acting on itself) of phainein "to show" (see phantasm).