Diaphanous
Diaphanous , adjective
[Greek {not transcribed}, from {not transcribed} to show or shine through; dia` through + {not transcribed} to show, and in the passive, to shine: compare French diaphane. See Phantom, and compare 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.