Hydrophane
[hahy-druh-feyn] /ˈhaɪ drəˌfeɪn/
noun
1.
a partly translucent variety of opal, which becomes more translucent or transparent when immersed in water.
/ˈhaɪdrəʊˌfeɪn/
noun
1.
a white partially opaque variety of opal that becomes translucent in water
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