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English definition of “fluid”

fluid

noun [C/U]  /ˈflu·ɪd/ us  
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.

fluid

adjective  /ˈflu·əd/ us  
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)
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