hydrometer

• hydrometre (nonstandard)

From hydro- +‎ -meter.

• IPA^(key): /haɪˈdɹɑːmɪtɚ/

• Audio (Southern England):

  (file)

• Rhymes: -ɒmɪtə(ɹ)

hydrometer (plural hydrometers)

1. An instrument that floats in a liquid and measures its specific gravity on a scale.

   Synonym: areometer

   Coordinate terms: specific gravity bottle, pycnometer

   • 1806, Peter Jonas, “Method of Ascertaining the Strength of Spiritous Liquors by Clarke’s Hydrometer”, in The Genuine Art of Gauging Made Easy and Familiar; Exhibiting All the Principal Methods Actually Practised by the Officers of His Majesty’s Revenue of Excise and Customs: [...], London: Printed [by C[harles] Whittingham] for Dring and Fage, […], →OCLC, page 367:

     [E]ach degree of the hydrometer, when at or near proof, is about a quart in a hundred gallons stronger or weaker, as the hydrometer vibrates under or over the silver speck or sight on the index or upper stem; at the intermediate or strong overproofs, is about a pint in ditto; and at the low underproofs is about three pints in ditto.

   • 1843, John Holmes Agnew, Eclectic Museum of Foreign Literature, Science and Art:

     On the wall were hanging thermometers, barometers, and hydrometers, and every other sort of ometer, numberless, dusty, and mysterious; […]

• Twaddell hydrometer
• thermohydrometer

• hygrometer

• hydrometre

From hydro- +‎ meter.

hydrometer c

1. a hydrometer

• areometer