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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


an opaque or semiopaque whitish glass
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈoʊ pə lɪn, -ˌlin, -ˌlaɪn)

like opal; opalescent.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


adjopalen (liter)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˈəʊpəˌlaɪn] nopalina
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
References in classic literature ?
The great cloud-barred disk of the sun stood just above a limitless expanse of tossing white-caps--so to speak--a billowy chaos of massy mountain domes and peaks draped in imperishable snow, and flooded with an opaline glory of changing and dissolving splendors, while through rifts in a black cloud-bank above the sun, radiating lances of diamond dust shot to the zenith.
Its nature is like opaline doves'-neck lustres, hovering and evanescent.
This glitter, this opaline lustre plays round the top of every toy to his eye to insure his fidelity, and he is deceived to his good.
The intriguing feature about this horizon is the epithermal vein system contains geyserite (opaline silica), lattice-type veining, and fluorite in the historical Rubicon trenches.
Today's updated design features a brown polished ceramic bezel ring and a matt chromium nitride tachymeter scale, as well as brown PVD subdials and a central opaline silvery dial.
It was made at the turn of the century and showed a green woodpecker perched on the branch of a tree, patiently waiting to catch supper in the limpid opaline blue waters of a lily pond.
Galle cameo glass vase, the blue opaline ground with a multilayered carving, on one side a large kingfisher perched on a branch, on the other, water lilies, aquatic flowers and leaves.
credit, it's still managed to keep a lot of empty breathing space on the dial, which is available in blue and black with a sunray, opaline and grained finish.
This ink is actually a mixture of secretions of two glands, the ink gland and the opaline gland, which are simultaneously released into the mantle cavity, mixed there, and then expelled through a siphon toward the site of predatory attack (Walters and Erickson, 1986).
The dial is a silvery opaline with gold-applied Brequet numerals.