fluid

adjective
flu·​id | \ ˈflü-əd How to pronounce fluid (audio) \

Definition of fluid

 (Entry 1 of 2)

1a : 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 openingsTechnical 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
3a : available for various uses a fluid computer program
b : liquid sense 4 fluid assets

fluid

noun

Definition of fluid (Entry 2 of 2)

: a substance (such as a liquid or gas) tending to flow or conform to the outline of its container

Keep scrolling for more

Other Words from fluid

Adjective

fluidly adverb
fluidness noun

Noun

fluidal \ ˈflü-​ə-​dᵊl How to pronounce fluidal (audio) \ adjective
fluidally \ ˈflü-​ə-​dᵊl-​ē How to pronounce fluidally (audio) \ adverb
fluidlike \ ˈflü-​ə-​dᵊl-​ˌlīk How to pronounce fluidlike (audio) \ adjective

Synonyms & Antonyms for fluid

Synonyms: Adjective

flowing, fluent, liquid

Antonyms: Adjective

hard, nonliquid, solid

Visit the Thesaurus for More 

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
See More

Recent Examples on the Web: Adjective

Actress Kristen Stewart—speaking in a recent Harper's Bazaar UK profile—says she was pressured to keep her fluid sexuality secret in order to boost her career. Isaac Feldberg, Fortune, "Kristen Stewart Was Told She ‘Might Get A Marvel Movie’ if She Kept Her Sexuality Quiet," 3 Sep. 2019 The fluid nature of Six Sigma, and its potential for almost unlimited abuse, was explained by Mikel Harry, a former Motorola executive and colleague of Bill Smith’s who became a Six Sigma evangelist and founder of the Six Sigma Management Institute. Oliver Staley, Quartz at Work, "Whatever happened to Six Sigma?," 3 Sep. 2019 Roberts’s presence suggests that the collective is not a fixed entity but a fluid organization that will regenerate over time. Carrie Battan, The New Yorker, "Brockhampton Grows Up," 2 Sep. 2019 Tijuana took a 2-1 lead in the 29th with an Ignacio Rivero goal that was part of Tijuana’s fluid offense but that one was answered by Salas. Ivan Orozco, San Diego Union-Tribune, "Defense lets Xolos down at Necaxa," 31 Aug. 2019 The equations of fluid dynamics are solved mathematically. Katherine Ellen Foley, Quartz, "How to read the maps that predict hurricane paths," 30 Aug. 2019 With a little help from computer simulations and fluid dynamics, engineers have finally optimized the craft of crepe making. Stephen Ornes, Scientific American, "Perfect Crepes, by Way of Physics," 29 Aug. 2019 That's according to Alexander Yarin, a physicist at the University of Illinois, Chicago, who specializes in fluid dynamics and is a co-author on both recent papers. Jennifer Ouellette, Ars Technica, "Physicists now have even better models for blood spatter from gunshot wounds," 29 Aug. 2019 The 6-foot cast-iron farmhouse sink in the kitchen was moved, the living room fireplace was updated to gas, and rooms were gutted to create a sprawling, fluid living area. Alia Akkam, House Beautiful, "You Need to See How a Sad 1920s House Was Restored to a Colorful, Pattern-Filled Home," 29 Aug. 2019

Recent Examples on the Web: Noun

Frequently water pools amid that white, glimmering a near-fluorescent blue that resembles windshield wiper fluid or Kool-Aid. Seth Borenstein, The Denver Post, "Earth’s future is being written in fast-melting Greenland," 21 Aug. 2019 Frequently water pools amid that white, glimmering a near-fluorescent blue that resembles windshield wiper fluid or Kool-Aid. Seth Borenstein, Anchorage Daily News, "Earth’s future is being written in fast-melting Greenland," 20 Aug. 2019 Frequently water pools amid that white, glimmering a near-fluorescent blue that resembles windshield wiper fluid or Kool-Aid. Washington Post, "Earth’s future in being written in fast-melting Greenland," 20 Aug. 2019 Frequently water pools amid that white, glimmering a near-fluorescent blue that resembles windshield wiper fluid or Kool-Aid. Seth Borenstein, BostonGlobe.com, "Earth’s future is being written in fast-melting Greenland," 20 Aug. 2019 The contracts follows a December award Woodside gave to Halliburton for drilling and completion fluids services. Sergio Chapa, Houston Chronicle, "Halliburton lands nine contracts for offshore project in West Africa," 12 Aug. 2019 Hepatitis B is primarily spread when blood, semen or certain other body fluids from an infected person enters someone else’s body. Laura Ungar, USA TODAY, "Hepatitis A is breaking out across the country in wake of opioid crisis," 10 Aug. 2019 Officials evacuated the prison dorm and medical staff quickly performed CPR and administered IV fluids to stabilize the canine, WFSA reported. Fox News, "Alabama police narcotics dog dies after falling ill during prison drug search," 25 July 2019 Nickelodeon will send its iconic green slime for ISS video demonstrations to school-age students about how fluids low in microgravity. Chabeli Herrera, orlandosentinel.com, "SpaceX plans to launch 5,000 pounds of cargo to ISS tonight. But storms may push it to August," 24 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fluid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of fluid

Adjective

1603, in the meaning defined at sense 1a

Noun

1661, in the meaning defined above

History and Etymology for fluid

Adjective and Noun

French or Latin; French fluide, from Latin fluidus, from fluere to flow; akin to Greek phlyzein to boil over

Keep scrolling for more

Learn More about fluid

Statistics for fluid

Last Updated

7 Sep 2019

Look-up Popularity

Time Traveler for fluid

The first known use of fluid was in 1603

See more words from the same year

Keep scrolling for more

More Definitions for fluid

fluid

adjective

English Language Learners Definition of fluid

 (Entry 1 of 2)

: capable of flowing freely like water
used to describe something that can change easily or that changes often
: having or showing a smooth and easy style

fluid

noun

English Language Learners Definition of fluid (Entry 2 of 2)

: a substance that is able to flow freely : a liquid substance

fluid

adjective
flu·​id | \ ˈflü-əd How to pronounce fluid (audio) \

Kids Definition of fluid

 (Entry 1 of 2)

1 : capable of flowing like a liquid or gas fluid lava
2 : having a graceful or flowing style or appearance a dancer's fluid movement

Other Words from fluid

fluidly adverb

fluid

noun

Kids Definition of fluid (Entry 2 of 2)

: something that tends to flow and take the shape of its container

fluid

adjective
flu·​id | \ ˈflü-əd How to pronounce fluid (audio) \

Medical Definition of fluid

 (Entry 1 of 2)

: 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

noun

Medical Definition of fluid (Entry 2 of 2)

: 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

Keep scrolling for more

More from Merriam-Webster on fluid

Rhyming Dictionary: Words that rhyme with fluid

Thesaurus: All synonyms and antonyms for fluid

Spanish Central: Translation of fluid

Nglish: Translation of fluid for Spanish Speakers

Britannica English: Translation of fluid for Arabic Speakers

Britannica.com: Encyclopedia article about fluid

Comments on fluid

What made you want to look up fluid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

recurring in steady succession

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!