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Old Gloucestershire words being revived in student project
(www.bbc.co.uk)
For all things down Gloucester way, like Dr Foster, presumably.
German is Fledermaus if I remember correctly, so Flittermouse seems to be Germanic in origin, as is the Swedish word, fladdermus. Etymology is interesting, but I know next to nothing about it. Guessing is fun, though. If I'm wrong here, I love to be educated.
I get why bat is preferred as the Germanic versions are more than a little clunky and not nearly as cool or scary sounding. Here comes the amazing Flittermouseman! Villains beware!
Raspy voice "I am Flittermouseman".