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fluid.

Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.

5 characters1 syllables approx.English language

Meaning & usage

noun/ˈfluːɪd/Received-Pronunciation/ˈflʉwɪd/British, Southern, Standard/ˈflu.ɪd/US/ˈflʉːɪd/Australia, New-Zealand

  1. Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.

    countable · uncountable

  2. A liquid (as opposed to a solid or gas).

    countable · uncountable

  3. Intravenous fluids.

    colloquial · countable · specifically · uncountable
Where this word comes from

Etymology tree Proto-Indo-European *bʰel-der. Proto-Indo-European *bʰlewH-der. Proto-Indo-European *bʰluH-yé-ti? Latin fluō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin fluidusder. Middle English fluid English fluid From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin fluō (“to flow”), from Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow; run”). Akin to Ancient Greek φλύειν (phlúein, “to swell; overflow”). Not related to English flow, which is a native, inherited word from *plew-, but is distantly related from English bleat.

adj/ˈfluːɪd/Received-Pronunciation/ˈflʉwɪd/British, Southern, Standard/ˈflu.ɪd/US/ˈflʉːɪd/Australia, New-Zealand

  1. Of or relating to fluid.

    not-comparable

  2. In a state of flux; subject to change.

  3. Moving smoothly, or giving the impression of a liquid in motion.

  4. Convertible into cash.

  5. Genderfluid.

    rare
Where this word comes from

Etymology tree Proto-Indo-European *bʰel-der. Proto-Indo-European *bʰlewH-der. Proto-Indo-European *bʰluH-yé-ti? Latin fluō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin fluidusder. Middle English fluid English fluid From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin fluō (“to flow”), from Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow; run”). Akin to Ancient Greek φλύειν (phlúein, “to swell; overflow”). Not related to English flow, which is a native, inherited word from *plew-, but is distantly related from English bleat.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.