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
Synonyms
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
Samantha Putterman, Austin American-Statesman, 22 Nov. 2024
For her debut spring 2025 collection, Waksal worked with lightweight and fluid materials in neutral tones (black, ivory, dusty gray, bone, army green and white) across mix-and-match styles that can easily move and be layered.
—Emily Mercer, WWD, 20 Nov. 2024
Amaris Encinas, USA TODAY, 6 Nov. 2024
Plus, many teas contain trace minerals and electrolytes, like potassium and magnesium, that help replace the balance of fluids in the body.17
Other evidence supports this rehydration theory, too.
—Cristina Mutchler, Verywell Health, 4 Nov. 2024
See all Example Sentences for fluid 
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Adjective
These kinds of claims reflect a poor understanding of history and the fluid nature and various interpretations of racial identity in the United States, race and politics experts say.
—Samantha Putterman, Austin American-Statesman, 22 Nov. 2024
For her debut spring 2025 collection, Waksal worked with lightweight and fluid materials in neutral tones (black, ivory, dusty gray, bone, army green and white) across mix-and-match styles that can easily move and be layered.
—Emily Mercer, WWD, 20 Nov. 2024
Noun
Canine distemper outbreak safety tips, recommendations The viral disease is commonly spread across wildlife species populations through bodily fluids like saliva or fecal matter, which is why keeping your pets away from raccoon territory is especially crucial.
—Amaris Encinas, USA TODAY, 6 Nov. 2024
Plus, many teas contain trace minerals and electrolytes, like potassium and magnesium, that help replace the balance of fluids in the body.17
Other evidence supports this rehydration theory, too.
—Cristina Mutchler, Verywell Health, 4 Nov. 2024
See all Example Sentences for fluid
Dictionary Entries Near fluid
Cite this Entry
“Fluid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluid. Accessed 29 Nov. 2024.
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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