Hydrophane
Hydrophane , noun
[Hydro-, 1 + Greek {not transcribed} to show, appear: compare French hydrophane.]
(Mineralogy) A semitranslucent variety of opal that becomes translucent or transparent on immersion in water.
Hydrophane , noun
[Hydro-, 1 + Greek {not transcribed} to show, appear: compare French hydrophane.]