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Definition of fluid

fluid

/ˈfluː.ɪd/
flu · id
Adverb:fluidly
•
Plural:fluids
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fluid Lexical Profile

fluid Game Scores & Validity

• noun

1

A substance that has no fixed shape and yields easily to external pressure, primarily encompassing liquids and gases.

Example

"The mechanical engineer tested the fluid to determine its viscosity under extreme temperature conditions."

2

A liquid produced by or secreted within a living organism.

Example

"The doctor advised the patient to drink plenty of fluids to stay properly hydrated during the recovery."

Synonyms
View all synonyms for fluid
Antonyms
View all antonyms for fluid

• Nearby Words

fluffiness
flufftail
fluffy
fluid
fluidity
fluidlike
fluidly

Word Origin & Etymology

From Latin 'fluidus' meaning 'flowing' or 'soft', derived from the verb 'fluere' (to flow).

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Fluid. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/fluid
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