English
hydrarchy
From hydro- + -archy.
Proto-Indo-European *wed- ‘water’
Proto-Indo-European *wódr̥ ‘water’
Proto-Hellenic *údōr ‘water’
Ancient Greek ὕδωρ ‘water’
English hydro
Today it means
noun A pseudogovernmental system of laws and justice between pirates at sea.
Language periods are conventional ranges, not dates for this word.
Etymograph / hydrarchy