English
hydropneumatic
From hydro- + pneumatic.
A compound of hydro- + pneumatic
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ῡ̆̔́δωρ ‘water’
English hydro-
Proto-Indo-European *pnew- ‘to breathe, sneeze’
Ancient Greek πνέω ‘to blow, breath’
Ancient Greek πνεῦμα ‘wind, air, breath, spirit’
Ancient Greek πνευματικός ‘relating to wind or air’
Latin pneumaticus
English pneumatic
Today it means
adj Operated by both fluid and air power
Language periods are conventional ranges, not dates for this word.
Etymograph / hydropneumatic