Where does “hydrograph” come from?

Hydrograph derives from Ancient Greek -γραφω (graphō, "to write") combined with Ancient Greek ὕδωρ (hydōr, "water"), tracing ultimately to Proto-Indo-European ger- meaning "to make" or "do."

hydrograph (English): A graph of flow past a point in a river versus...

Definitions

  1. A graph of flow past a point in a river versus...

Ancestry of “hydrograph”, step by step

hydrograph traces back through two separate lines of ancestry.

via English graph

StepLanguageWordMeaning
1EnglishgraphA data chart intended to illustrate the...
2Ancient Greekγράφωto scratch, cut into; to draw, sketch, paint; to...
3Proto-Hellenicgrəpʰōto scratch, cut or carve into
4Proto-Indo-Europeangerbʰ-to carve
5Proto-Indo-Europeanger-to turn, bend, twist, wind; to tie, bind...

via English hydro

StepLanguageWordMeaning
1Englishhydrohydroelectric; hydroponic; hydroelectric power
2Ancient Greekὕδωρwater; rainwater, rain; sweat
3Proto-Hellenic*údōrwater
Every word from Proto-Indo-European ger-Every word from Proto-Indo-European gerbʰ-Every word from Proto-Hellenic grəpʰō