hydromechanics

Etymology 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-
Proto-Indo-European *megʰ-der.?
Ancient Greek μηχανή (mēkhanḗ)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ικός (-ikós)
Ancient Greek μηχανικός (mēkhanikós)bor.
Latin mēchanicusbor.
English mechanics
English hydromechanics
From hydro- + mechanics.