exciton[ek sī′tän, ek′sə tän′]
a localized, electrically neutral, excited state that allows the transfer of energy but not electric charge through a semiconductor, insulator, etc., as an electron bound to a positive hole
An electrically neutral excited state of an insulator or semiconductor, often regarded as a bound state of an electron and a hole.
Origin of excitonexcit(ation) + –on1.
excite + -on