luminophor

[loo-muh-nuh-fawr, -fohr]

noun Physics, Chemistry.

a molecule or group of molecules that emits light when illuminated.

Also, lu·mi·no·phor.

Origin:
1905–10; < Latin lūmin- (see lumen) + -o- + -phore

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Luminophor is always a great word to know.

So is flibbertigibbet. Does it mean:

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

a chattering or flighty, light-headed person.

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lu·mi·no·phore