1. Of such fine texture as to be transparent or translucent: diaphanous tulle.2. Characterized by delicacy of form. See synonyms at airy. 3. Vague or insubstantial: diaphanous dreams of glory.
ETYMOLOGY:
From Medieval Latin diaphanus, transparent, from Greek diaphans, from diaphainein, to be transparent : dia-, dia- + phainein, phan-, to show; see bh-1 in Appendix I.