Webster's English Dictionary

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scintillation

scin.til.la.tion \.sint-*l-'a--sh*n\ n 1: an act or instance of 
   scintillating; esp : rapid changes in the  brightness of a celestial body 
   2a1: a spark or flash emitted in scintillating  2a2: a flash of light 
   produced in a phosphor by an ionizing event  2b: a scintillating or 
   brilliant outburst (as of wit)  2c: a flash of the eye  3: SCINTILLA