[oh-puh-lin, -leen, -lahyn]
of or like opal; opalescent.

1775–85; opal + -ine1

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World English Dictionary
opaline (ˈəʊpəˌlaɪn)
1.  opalescent
2.  an opaque or semiopaque whitish glass

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Structures to be examined include the ink gland, opaline gland and white skin vesicles.
The skeletons are essentially amorphous hydrated or opaline silica, but occasionally include some alumina.
Most phytoliths are opaline silica but many are formed of calcium oxalate.
The skeletons are essentially amorphous hydrated or opaline silica but occasionally are partly composed of alumina.
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