1
a
: having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure : capable of flowing
a long screw that forces the fluid chocolate through fine openings—
Technical Survey
Technical Survey
b
: subject to change or movement
boundaries became fluid
2
: characterized by or employing a smooth easy style
the ballerina's fluid movements
fluid recitation of his lines
3
a
: available for various uses
a fluid computer program
b
: liquid sense 4
fluid assets
fluidly
adverb
fluidness
noun
: a substance (such as a liquid or gas) tending to flow or conform to the outline of its container
Examples of fluid in a Sentence
Adjective
a substance in a fluid state
warm the jam until it is fluid, then spread it over the cake
Noun
Please check the fluids in the car's engine.
She needs to drink plenty of fluids.
Fluid leaked from the car's engine.
a bottle of yellow fluid
Recent Examples on the Web
Kate Wieczorek, Forbes, 16 Mar. 2025
Fassbender, who previously worked with the director on Haywire, described Soderbergh's process as uniquely fluid.
—Mark Davis, Newsweek, 14 Mar. 2025
Fiona Embleton, Glamour, 14 Mar. 2025
Blood pressure medications work to: Rid the body of fluid to get your water and salt levels at normal ranges.
—Lana Barhum, Verywell Health, 14 Mar. 2025
See All Example Sentences for fluid
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Adjective
Workers taking extended periods of time off will create a more fluid and dynamic workforce.
—Kate Wieczorek, Forbes, 16 Mar. 2025
Fassbender, who previously worked with the director on Haywire, described Soderbergh's process as uniquely fluid.
—Mark Davis, Newsweek, 14 Mar. 2025
Noun
This is because a lack of protein affects the balance of fluids in your tissues, says Lakhani-Kanji.
—Fiona Embleton, Glamour, 14 Mar. 2025
Blood pressure medications work to: Rid the body of fluid to get your water and salt levels at normal ranges.
—Lana Barhum, Verywell Health, 14 Mar. 2025
See All Example Sentences for fluid
Cite this Entry
“Fluid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluid. Accessed 22 Mar. 2025.
Copy CitationKids Definition
fluid
1 of 2 adjective
flu·id
ˈflü-əd 
1
a
: capable of flowing like a liquid or gas
b
: likely or tending to change or move
2
: showing a smooth easy style
fluid movements
fluidly
adverb
fluidness
noun
fluid
2 of 2 noun
: a substance tending to flow or take the shape of its container
liquids and gases are fluids
Etymology
Adjective
from French fluide or Latin fluidus, both meaning "fluid, able to flow," from Latin fluere "to flow" — related to affluent, fluent, flush entry 2, influence, superfluous
Medical Definition
fluid
1 of 2 adjective
flu·id
ˈflü-əd
: having particles that easily move and change their relative position without a separation of the mass and that easily yield to pressure : capable of flowing
fluid
2 of 2 noun
: a substance (as a liquid or gas) tending to flow or conform to the outline of its container
specifically
: one in the body of an animal or plant see cerebrospinal fluid, seminal fluid
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