English
thunderfly
From thunder + fly.
Proto-Indo-European *(s)ten-
Proto-Germanic *þunraz
Proto-West Germanic *þunr
Old English þunor
Middle English thunder
English thunder
Proto-Indo-European *plew- ‘to fly, flow, run’
…
Proto-Germanic *fleugǭ ‘flying insect, fly’
Proto-West Germanic *fleugā ‘fly’
Old English flēge ‘a fly’
Middle English fflye
English fly
Today it means
noun Any insect of the genus Thrips.
Language periods are conventional ranges, not dates for this word.
Etymograph / thunderfly