Where does “inHg” come from?

inHg (Translingual) comes from Translingual Hg, from Latin hydrargyrus, from Ancient Greek ὑδράργυρος, from Ancient Greek ὕδωρ, from Proto-Hellenic *údōr — water.

Ancestry of “inHg”, step by step

StepLanguageWordMeaning
1TranslingualHgmercury
2Latinhydrargyrusquicksilver (artificially prepared), mercury
3Ancient Greekὑδράργυροςquicksilver artificially prepared from cinnabar...
4Ancient Greekὕδωρwater; rainwater, rain; sweat
5Proto-Hellenic*údōrwater
Every word from Proto-Hellenic *údōr →Every word from Ancient Greek ὕδωρ →Every word from Ancient Greek ὑδράργυρος →