baɪ ˈoʊpəlˌaɪn ɡlˈæs wiː mˈiːn ɐ mˈɪlki ɡlˈæs, wˌɪtʃ kæn biː wˈaɪt ɔːɹ kˈʌlɚd, ænd ɪz mˌeɪd tɹænslˈuːsənt ɔːɹ oʊpˈeɪk baɪ ˈædɪŋ pɚtˈɪkjʊlɚ fˈɑːsfeɪts ɔːɹ ˈɑːksaɪdz dˈʊɹɹɪŋ ðə mˈɪksɪŋ.
By opaline glass we mean a milky glass, which can be white or colored, and is made translucent or opaque by adding particular phosphates or oxides during the mixing.