opalescent

[oh-puh-les-uhnt]
adjective
1.
exhibiting a play of colors like that of the opal.
2.
having a milky iridescence.

Origin:
1805–15; opal + -escent

opalescence, noun
opalescently, adverb
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World English Dictionary
opalescent (ˌəʊpəˈlɛsənt)
 
adj
having or emitting an iridescence like that of an opal
 
opal'escence
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

opalescent
1813, from opal.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

opalescent o·pal·es·cent (ō'pə-lěs'ənt)
adj.
Resembling an opal in the display of various colors, often used to describe certain bacterial cultures.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
opalescent   (ō'pə-lěs'ənt)  Pronunciation Key 
Exhibiting a milky iridescence like that of opal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They are astonishing, those eyes: pale and opalescent, with vagrant beams of light glancing from the corneas.
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