hydrometrograph

== English == === Etymology === From hydro- +‎ metro- +‎ -graph. === Noun === hydrometrograph (plural hydrometrographs) (historical) A flowmeter for measuring and sometimes recording the quantity of a liquid discharged from a pipe over time. === References === “hydrometrograph”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.