hydromagnetic

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-
Old French magnetebor.
Pre-Greekbor.?
Ancient Greek Μάγνης (Mágnēs)
Ancient Greek μᾰ́γνης (mắgnēs)bor.
Latin magnēsbor.
Middle English magnete
English magnet
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
English magnetic
English hydromagnetic
From hydro- + magnetic.