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1. A mineral of hydrated silica.
2. A gemstone made of this mineral, noted for its rich iridescence.
[Early Modern English, from Middle French opale, from Latin opalus, alteration of Greek opallios, probably from Sanskrit upalaḥ, stone, precious stone (often in the sandhi form opalaḥ in the names of gems such as nīlopalaḥ, sapphire : nīla-, blue + upalaḥ), possibly variant of upara-, lower, from upa, towards, under, down; see upo in the Appendix of Indo-European roots.]
o′pal·ine′ (ō′pə-līn′, -lēn′) adj.
an opaque or semiopaque whitish glass
o•pal•ine(ˈoʊ pə lɪn, -ˌlin, -ˌlaɪn)
like opal; opalescent.
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|Adj.||1.||opaline - having a play of lustrous rainbow colors; "an iridescent oil slick"; "nacreous (or pearlescent) clouds looking like mother-of-pearl"; "a milky opalescent (or opaline) luster"|
bright - emitting or reflecting light readily or in large amounts; "the sun was bright and hot"; "a bright sunlit room"