[fos-fer, -fawr] /ˈfɒs fər, -fɔr/

the morning star, especially Venus.
a substance, such as the coating on a cathode-ray tube, capable of emitting light when irradiated with particles or electromagnetic radiation

“morning star,” 1630s, from Latin phosphorus “the morning star” (see phosphorus). Meaning “anything phosphorescent” is from 1705.
Any of various substances that can emit light after absorbing some form of radiation. Television screens and fluorescent lamp tubes are coated on the inside with phosphors. See Note at cathode-ray tube.


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  • Phosphoresce

    [fos-fuh-res] /ˌfɒs fəˈrɛs/ verb (used without object), phosphoresced, phosphorescing. 1. to be luminous without sensible heat, as . /ˌfɒsfəˈrɛs/ verb 1. (intransitive) to exhibit phosphorescence

  • Phosphorescence

    [fos-fuh-res-uh ns] /ˌfɒs fəˈrɛs əns/ noun 1. the property of being luminous at temperatures below incandescence, as from slow oxidation in the case of phosphorus or after exposure to light or other radiation. 2. a luminous appearance resulting from this. 3. any luminous radiation emitted from a substance after the removal of the exciting agent. […]

  • Phosphorescent

    [fos-fuh-res-uh nt] /ˌfɒs fəˈrɛs ənt/ adjective 1. exhibiting . /ˌfɒsfəˈrɛsənt/ adjective 1. exhibiting or having the property of phosphorescence adj. 1766, from Modern Latin phosphorus (see phosphorus) + -escent. Related: Phosphorescently.

  • Phosphoreted

    [fos-fuh-ret-id] /ˈfɒs fəˌrɛt ɪd/ adjective, Chemistry. 1. .

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