Source : Webster's Revised Unabridged Dictionary (1913)

Phosphoresce \Phos`phor*esce"\, v. i. [imp. & p. p.
   {Phosphoresced}; p. pr. & vb. n. {Phosphorescing}.]
   To shine as phosphorus; to be phosphorescent; to emit a
   phosphoric light.

Source : WordNet®

phosphoresce
     v : to exhibit phosphorescence