"Electrocute" is a portmanteau of "electricity" and "execute".
I suspect a dictionary might accept it as an 'informal' alternative to the main 'death by' definition.
Laziness subsided, my Collins (complete, 2016) - which is a rather accepting dictionary of new-fangled words or usages - has only two definitions, both involving death. (1. to kill as a result of electric shock; 2. (US) to execute in an electric chair).
chortle (chuckle/snort) podcast (ipod/broadcast) newscast (news/broadcast) sportscaster (sports/broadcaster) motel (motor/hotel) email (electronic/mail) blog (web/log) bit (binary/digit) chunnel (channel/tunnel)