12 letters · 25 points in Scrabble
adjective relating to fluids in motion or the forces that produce or affect such motion
originEtymology tree Proto-Indo-European *wed- Proto-Indo-European *-r̥ Proto-Indo-European *wódr̥ Proto-Hellenic *údōr Ancient Greek ῡ̆̔́δωρ (hū̆́dōr) Ancient Greek ῠ̔δρο- (hŭdro-)der. English hydro- English kinetic English hydrokinetic From hydro- + kinetic.
Etymology from Wiktionary, CC BY-SA 3.0