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The Collaborative International Dictionary of English v.0.48 (gcide)

Phosphor \Phos"phor\ (f[o^]s"f[^o]r or f[o^]s"f[o^]r), n. [Cf.
G. phosphor. See {Phosphorus}.]
1. Phosphorus. [Obs.] --Addison.
[1913 Webster]

2. The planet Venus, when appearing as the morning star;
Lucifer. [Poetic and Rare] --Pope. --Tennyson.
[1913 Webster]

3. A phosphorescent substance. [archaic]
[PJC]

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.
[PJC]