01 n. Phosphorus.
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1.
Phosphorus.[Obs.]
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2.
The planet Venus, when appearing as the morning star; Lucifer.[Poetic and Rare]
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3.
A phosphorescent substance.[archaic]
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4.
A substance capable of exhibiting luminescence. This term is now most commonly used to refer to substances used in fluorescent lights, image intensifiers, or cathode-ray tubes (CRT's), which luminesce when excited by ultraviolet radiation or an electron beam. In color CRT's, three different phosphors, each giving different colors when excited, are used.