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Found it in Merriam-Webster Dictionary:       scin·til·la·tion noun \?sin-t?-?l?-sh?n\

Definition of SCINTILLATION

1
: an act or instance of scintillating; especially : rapid changes in the brightness of a celestial body
2
a : a spark or flash emitted in scintillating
b : a flash of light produced in a phosphor by an ionizing event
3
: a brilliant outburst (as of wit)
4
: a flash of the eye
First Known Use of SCINTILLATION

circa 1623
scin·til·la·tion noun , often attrib \?sint-?l-??-sh?n\ (Medical Dictionary)
Medical Definition of SCINTILLATION

: a flash of light produced in a phosphor by an ionizing event
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