Diaphanous

Di*aph"a*nous (?), a. [Gr. ?, fr. ? to show or shine through; dia` through + ? to show, and in the passive, to shine: cf. F. diaphane. See Phantom, and cf. Diaphane, Diaphanic.] Allowing light to pass through, as porcelain; translucent or transparent; pellucid; clear.

Another cloud in the region of them, light enough to be fantastic and diaphanous.
Landor.