hydrometer

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hy·drom·e·ter / hīˈdrämitər/ • n. an instrument for measuring the density of liquids.DERIVATIVES: hy·dro·met·ric / ˌhīdrəˈmetrik/ adj.hy·drom·e·try / -itrē/ n.

hydrometer

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hydrometer (hy-drom-it-er) n. an instrument for measuring the density or relative density of liquids.
hydrometry n.