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.
power steering fluid
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.
Thesaurus: synonyms and related words
Physics: the state of matter
- absorbency
- acid
- acidic
- filtrate
- granulated
- gritty
- heavy water
- limy
- liquid
- molten
- non-flammable
- permeability
- plasma
- powder
- powdered
- pressurized
- runny
- slurry
- sulphur
- thin
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fluidadjective
uk/ˈfluː.ɪd/us/ˈfluː.ɪd/fluid adjective (MOVEMENT)
C2 smooth and continuous:
fluid movements
Thesaurus: synonyms and related words
Continuous & permanent
- abiding
- ad infinitum
- around-the-clock
- be
- bounce
- ceaseless
- fluidity
- here to stay idiom
- immanent
- imperishable
- incessant
- indelible
- inextinguishable
- nagging
- perpetuity
- persistence
- persistent
- round-the-clock
- seamless
- trot
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fluid adjective (LIKELY TO CHANGE)
If situations, ideas, or plans are fluid, they are not fixed and are likely to change, often repeatedly and unexpectedly:
The military situation is still very fluid.
Thesaurus: synonyms and related words
Changing
- a new broom sweeps clean idiom
- about-turn
- alter
- alternate
- alternation
- bastardize
- convert
- move on
- move the goalposts idiom
- move with the times idiom
- new
- new broom
- onto
- reverse
- swing
- transfigure
- transform
- transitional
- transmogrify
- transmute
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