English
flittermouse
From flitter + mouse (compare flickermouse, flindermouse), after Middle Dutch fleddermuys, vledermuys, vlermuys (Modern Dutch vleermuis), from vledderen, vlederen (“to flutter, float, hover”) + muys (“mouse”).
Today it means
noun A bat (a flying mammal).
Language periods are conventional ranges, not dates for this word.
Etymograph / flittermouse