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English definition of “fluid”

fluid

noun [C or U]     /ˈfluː.ɪd/
C2 a substance that flows and is not solid: If you have a fever you should drink plenty of fluid(s). The virus is contracted through exchange of bodily fluids.The state of matter
(Definition of fluid noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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