Meaning of “fluid” in the English Dictionary

"fluid" in British English

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fluidnoun [ C or U ]

uk /ˈfluː.ɪd/ us /ˈfluː.ɪd/

C2 a substance that flows and is not solid:

If you have a fever you should drink plenty of fluids.
The virus is contracted through exchange of bodily fluids (= liquids, such as blood, that come from the human body).

More examples

  • The patient was severely dehydrated and needed fluids urgently.
  • These tanks are used for storing fluids such as oil, petrol and kerosene.
  • Keep all your household cleaning fluids where children cannot reach them.
  • Your stomach produces a large quantity of gastric fluid.
  • There's some kind of thick fluid oozing from the trunk of the tree.


uk /ˈfluː.ɪd/ us /ˈfluː.ɪd/

(Definition of “fluid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fluid" in American English

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fluidnoun [ C/U ]

us /ˈflu·ɪd/

a substance that flows and is not solid:

[ U ] The doctor drained some fluid from her lungs.

medical Fluids are liquids that you drink:

[ C ] Dr. Tay says I need rest and lots of fluids.


us /ˈflu·əd/

having a flowing or changing quality:

a dancer’s fluid movements
The situation remains fluid – we offered her the job, but she hasn’t responded yet.

(Definition of “fluid” from the Cambridge Academic Content Dictionary © Cambridge University Press)