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phosphor

phos·phor

noun \ˈfäs-fər, -ˌfȯ(ə)r\

: a phosphorescent substance; specifically : a substance that emits light when excited by radiation

phos·phor also phos·phore \-ˌfō(ə)r, -ˌfȯ(ə)r, -fər\

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