hydrobarometer

== English == === Etymology === From hydro- +‎ barometer. === Noun === hydrobarometer (plural hydrobarometers) (historical) An early form of depth gauge, that measured water pressure, as well as temperature. ==== Derived terms ==== === References === “hydrobarometer”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.