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
Oliver Thomas, Forbes, 4 Nov. 2024
Rather than go for the plucked, plum tone of 1970s R&B bass, Jones welcomed his old pal, jazz bassist Ray Brown, to the proceedings and gave this sweet noir ballad a fluid groove and a slow dancing kick.
—A.d. Amorosi, Variety, 4 Nov. 2024
Kelly Davis, The Mercury News, 4 Nov. 2024
After two hours of IV fluids, one dose of antibiotics, and some Tylenol, Crain’s fever didn’t go down, her pulse remained high, and the fetal heart rate was abnormally fast, medical records show.
—Lizzie Presser and Kavitha Surana, CNN, 3 Nov. 2024
See all Example Sentences for fluid 
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Adjective
Four games marked the minimum time missed under league rules, yet given the serious, fluid nature behind the absence, there was no timetable.
—Oliver Thomas, Forbes, 4 Nov. 2024
Rather than go for the plucked, plum tone of 1970s R&B bass, Jones welcomed his old pal, jazz bassist Ray Brown, to the proceedings and gave this sweet noir ballad a fluid groove and a slow dancing kick.
—A.d. Amorosi, Variety, 4 Nov. 2024
Noun
An autopsy report found that his lungs had doubled in size from fluid.
—Kelly Davis, The Mercury News, 4 Nov. 2024
After two hours of IV fluids, one dose of antibiotics, and some Tylenol, Crain’s fever didn’t go down, her pulse remained high, and the fetal heart rate was abnormally fast, medical records show.
—Lizzie Presser and Kavitha Surana, CNN, 3 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 22 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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