Etymology
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Phosphor (n.)

"the morning star, Lucifer," 1630s, from Latin Phosphorus "the morning star," literally "light-bringing" (see phosphorus). Meaning "anything phosphorescent" is from 1705.

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Definitions of Phosphor

phosphor (n.)
a synthetic substance that is fluorescent or phosphorescent; used to coat the screens of cathode ray tubes;
From wordnet.princeton.edu