opalesce

o·pal·esce

[oh-puh-les]
verb (used without object), o·pal·esced, o·pal·esc·ing.
to exhibit a play of colors like that of the opal.

Origin:
1810–20; back formation from opalescent

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World English Dictionary
opalesce (ˌəʊpəˈlɛs) [Click for IPA pronunciation guide]
 
vb
(intr) to exhibit a milky iridescence

Collins English Dictionary - Complete & Unabridged 10th Edition
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Opalesce is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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