noun (n)

• light not due to incandescence; occurs at low temperatures(noun.phenomenon)

  source: wordnet30
• light from nonthermal sources(noun.attribute)

  Synonym:
  glow
  

  source: wordnet30
• Any emission of light not ascribable directly to incandescence, and therefore occurring at low temperatures, as in phosphorescence and fluorescence or other luminous radiation resulting from vital processes, chemical action, friction, solution, or the influence of light or of ultraviolet or cathode rays, etc.(noun)

  source: webster1913