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pho·to·elec·tron .fōt-ō-i-'lek-.trän n an electron released in photoemission
pho·to·elec·tron·ic -.lek-'trän-ik adj
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pho·to·elec·tron (fo″to-e-lekґtron) an electron emitted from a metallic surface when the latter is illuminated with light, especially with light of short wavelength.Medical dictionary. 2011.