A device, person, or thing that electrifies; something that generates or supplies electricity.
From 'electrify' plus suffix '-er' meaning one who does or a thing that does. The '-er' agent suffix is one of the oldest in English.
An 'electrifier' is charmingly old-fashioned for what we'd now call a 'power generator' or 'power supply'—it shows how technical vocabulary constantly gets replaced!
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