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What do a.m. and p.m. stand for?

luminous paint

noun
1.
paint containing a phosphor that emits visible light when irradiated with ultraviolet light.
Origin of luminous paint
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Value for luminous

10
15
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