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

Antonyms: Adjective

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 The talks are fluid and may not result in a transaction, the people said. Yoolim Lee, Bloomberg.com, "SoftBank’s Son Presses Grab for Truce With Rival Gojek," 15 Oct. 2020 Rules of engagement have been fluid as Hollywood has struggled to reopen. Nardine Saad Staff Writer, Los Angeles Times, "COVID-19 leads Netflix to cancel ‘GLOW’ even though final season was underway," 5 Oct. 2020 But scheduling has been fluid since the pandemic began. oregonlive, "UO Ducks track team gets an early Christmas present Friday when the doors are thrown open at Hayward Field," 1 Oct. 2020 While acknowledging that decisions throughout college football are fluid, Hancock was optimistic that by the time of the first playoff rankings — Nov. 17 — some clarity could develop. Randy Johnson, Star Tribune, "As normalcy returns, ranking college football teams will be more difficult than ever," 25 Sep. 2020 The fluid structure and international reach make the El Jabao Organization significantly different from the vast and highly regimented Cuban-American mafia once headed by the late Jose Miguel Battle Sr. Mario Ariza, sun-sentinel.com, "El Jabao: The greatest Cuban crime syndicate you’ve never heard of.," 3 Oct. 2020 Last week, technicians worked on several vehicles of working-poor customers of the Lift Garage on E. Lake Street in Minneapolis that need tires, batteries, fluid changes and the like. Star Tribune, "How businesses, government agencies work together to update pollution-spewing older cars," 3 Oct. 2020 Hayes’ fluid style has drawn comparisons to former Warriors point guard D’Angelo Russell. Connor Letourneau, SFChronicle.com, "Warriors draft: Why Killian Hayes could be an intriguing option at No. 2," 2 Oct. 2020 Distant heart sounds could reflect pericardial effusion—fluid accumulating around the heart. Danielle Ofri, The New Yorker, "A Bellevue Doctor’s Pandemic Diary," 1 Oct. 2020 Recent Examples on the Web: Noun In response to the pandemic, Bibus said, one of their suppliers, Froggy's Fog, which makes fluid for fog-making machines, shifted production to sell hand sanitizer. Richard Chin, Star Tribune, "Twin Cities Halloween attractions switch to drive-through, drive-in or virtual haunts to be safe and scary," 13 Oct. 2020 The art of creating RPG combat systems lies in finding ways to make the flow seem fluid and the challenge approachable and fun, without ruining suspension of disbelief. Jim Salter, Ars Technica, "I played 15 hours of Baldur’s Gate 3 early access, and I want them back," 6 Oct. 2020 While this unctuous fluid has plenty of things in its favor, there is a dark side to it. Tim Macwelch/outdoor Life, Popular Science, "Bone broth will sustain you at home and in the wild. Here’s how to make it.," 5 Oct. 2020 These can damage blood vessels and allow fluid to seep into the lungs. Anna Wilde Mathews, WSJ, "Trump’s Covid-19 Treatment Seeks to Boost Immune Response," 5 Oct. 2020 But a case report published Thursday highlighted one extremely rare complication that occurred after one woman's coronavirus test: a brain fluid leak. Korin Miller, Health.com, "Woman Suffers Extremely Rare Brain Fluid Leak After Coronavirus Test—Here's What You Need to Know," 2 Oct. 2020 Following the clinical exam, the doctor may perform an ultrasound, which can help determine whether a lump is smooth or irregular, and solid or fluid-filled. Jenny Mccoy, Glamour, "What a Lump in Your Breast Could Mean (Besides Cancer)," 1 Oct. 2020 Tohidi, assistant professor of fire and fluid dynamics in the Department of Mechanical Engineering, is an expert in wildfire spread and spot fire ignition. Lauren Hernández, SFChronicle.com, "New SJSU wildfire research center seeks to improve forecasting tools to help California firefighters," 7 Sep. 2020 Staff members told the board that the limousine's brake system was corroded and that the brake line was crimped, which would have restricted amount of fluid able to flow to the right rear brake. Michael Hill, Star Tribune, "Feds fault operator, regulators in limo crash that killed 20," 29 Sep. 2020

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

Time Traveler for fluid

Time Traveler

The first known use of fluid was in 1603

See more words from the same year

Statistics for fluid

Last Updated

20 Oct 2020

Cite this Entry

“Fluid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluid. Accessed 30 Oct. 2020.

Keep scrolling for more

More Definitions for fluid

fluid

adjective
How to pronounce fluid (audio)

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

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

Test Your Vocabulary

Here Be Dragons: A Creature Identification Quiz

  • monster werewolf photo
  • Which is a synonym of werewolf?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

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!