English
freestream
From free + stream.
Proto-Indo-European *preyH- ‘to please; to love’
…
Proto-Germanic *frijaz ‘free’
Proto-West Germanic *frī ‘free’
Old English frēo ‘free, at liberty’
Middle English fre ‘having the status of a freeman’
English free
Proto-Indo-European *srew- ‘to flow’
…
Proto-Germanic *straumaz
Proto-West Germanic *straum
Old English strēam
Middle English streem
English stream
Today it means
noun The air far upstream of an aerodynamic body, i.e. before the body has a chance to deflect, slow down or compress the air.
Language periods are conventional ranges, not dates for this word.
Etymograph / freestream