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English definition of “hydrometer”

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noun [C] uk   /haɪˈdrɒ.ɪ.tər/ us    /-drɑː.mə.t̬ɚ/ specialized
a piece of equipment used to measure the density (= amount of matter in a particular quantity) of liquids, especially a long glass tube, closed and with a weight at one end so that it floats vertically
(Definition of hydrometer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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