Where does “hydrothoracic” come from?

hydrothoracic (English) comes from English thoracic, from Ancient Greek θωρακικός, from Ancient Greek -ικός, from Ancient Greek -κός, from Proto-Indo-European -ḱos — -y, -ic.

hydrothoracic (English): Relating to hydrothorax

Definitions

  1. Relating to hydrothorax

Ancestry of “hydrothoracic”, step by step

hydrothoracic traces back through two separate lines of ancestry.

via English thoracic

StepLanguageWordMeaning
1EnglishthoracicOf the thorax; One of a group of fishes having...
2Ancient Greekθωρακικόςsuffering in the chest, of the thorax
3Ancient Greek-ικόςof or pertaining to, in the manner of; -ic
4Ancient Greek-κόςforms adjectives with the sense of 'of or...
5Proto-Indo-European-ḱos-y, -ic

via English hydro

StepLanguageWordMeaning
1Englishhydrohydroelectric; hydroponic; hydroelectric power
2Ancient Greekὕδωρwater; rainwater, rain; sweat
3Proto-Hellenic*údōrwater
Every word from Proto-Indo-European -ḱosEvery word from Ancient Greek -ικόςEvery word from Ancient Greek -κός