Hydrometer

//haɪˈdɹɑːmɪtɚ// noun

noun ·Rare ·Advanced level

Definitions

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

    "[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."

  2. 2
    a measuring instrument for determining the specific gravity of a liquid or solid wordnet

Synonyms

All synonyms
areometergravimeter

Example

More examples

"[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."

Etymology

From hydro- + -meter.

Related phrases

Twaddell hydrometerspecific gravity

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.