English
hydrospeed
From hydro- + speed.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *speh₁- ‘to prosper’
…
Proto-West Germanic *spōan ‘to succeed’
Proto-West Germanic *spōdi ‘prosperity’
Old English spēd ‘success’
Middle English sped ‘prosperity’
English speed
Today it means
noun riverboarding
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrospeed