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English definition of “hydrometer”

hydrometer

noun [C]     /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 Laboratory equipment
(Definition of hydrometer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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