Wiktionary
opal glass
n. type of opaque, translucent glass
WordNet
opal glass
n. a milky white translucent or opaque glass [syn: milk glass]
Usage examples of "opal glass".
A cup of opal glass materialized in front of her and skimmed across the air to Keff's tray.
Then the graphs were removed and placed on the illuminated opal glass.