fluid

English Online Dictionary. What means fluid‎? What does fluid mean?

English

Etymology

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-.

Pronunciation

• IPA^(key): /ˈfluːɪd/, /ˈflɪu̯ɪd/
• (obsolete) IPA^(key): /ˈfljuːɪd/
• Rhymes: -uːɪd

Noun

fluid (countable and uncountable, plural fluids)

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.
2. A liquid (as opposed to a solid or gas).
   • For more quotations using this term, see Citations:fluid.
3. (specifically, medicine, colloquial, typically in the plural) Intravenous fluids.

Derived terms

Translations

Adjective

fluid (comparative more fluid, superlative most fluid)

1. (not comparable) Of or relating to fluid.
2. In a state of flux; subject to change.
3. Moving smoothly, or giving the impression of a liquid in motion.
4. (of an asset) Convertible into cash.
5. (rare) Genderfluid.
   • 2017, Rick Riordan, Magnus Chase and the Hammer of Thor (→ISBN), page 274 (the genderfluid character Alex Fierro is speaking):

     “Oh, Loki made sure of that. My mortal parents blamed him for the way I was, for being fluid.”

Synonyms

• (of or relating to fluid): fluidical, liquid; see also Thesaurus:fluidic
• (subject to change): unstable, variable; see also Thesaurus:changeable
• (moving smoothly): fluent, fluxive; see also Thesaurus:flowing or Thesaurus:runny

Derived terms

Translations

Related terms

• fluctuate
• fluctuation
• fluency
• fluent
• flux
• fluidal
• fluidic
• fluidics
• fluidify
• fluidise
• fluidize
• fluidity
• fluidous
• semifluid

References

Further reading

• “fluid”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “fluid”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “fluid”, in OneLook Dictionary Search.

Catalan

Etymology

Borrowed from Latin fluidus.

Pronunciation

• IPA^(key): (Central, Balearic, Valencia) [ˈflujt]

Adjective

fluid (feminine fluida, masculine plural fluids, feminine plural fluides)

1. fluid

   Synonym: fluent

2. (figurative) fluid, fluent, smooth

   estil fluid ― fluid style

Derived terms

• fluïdesa
• superfluid

Related terms

• fluir
• fluïditat

Noun

fluid m (plural fluids)

1. fluid

Derived terms

• fluïditzar

Related terms

• fluídica

Further reading

• “fluid” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “fluid”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2025
• “fluid” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.
• “fluid” in Diccionari català-valencià-balear, Antoni Maria Alcover and Francesc de Borja Moll, 1962.

German

Adjective

fluid (strong nominative masculine singular fluider, not comparable)

1. fluid

   Synonym: flüssig

Declension

Further reading

• “fluid” in Duden online
• “fluid” in Digitales Wörterbuch der deutschen Sprache

Norwegian Bokmål

Noun

fluid n (definite singular fluidet, indefinite plural fluid or fluider, definite plural fluida or fluidene)

1. a fluid

Synonyms

• væske

Derived terms

• fluidmekanikk

References

• “fluid” in The Bokmål Dictionary.

Norwegian Nynorsk

Noun

fluid n (definite singular fluidet, indefinite plural fluid, definite plural fluida)

1. a fluid

Synonyms

• væske

Derived terms

• fluidmekanikk

References

• “fluid” in The Nynorsk Dictionary.

Polish

Etymology

Internationalism; compare English fluid, French fluide, German Fluid, ultimately from Latin fluidus.

Pronunciation

• IPA^(key): /ˈflu.it/
• Rhymes: -uit
• Syllabification: flu‧id

Noun

fluid m inan

1. (cosmetics) foundation (cosmetic cream roughly skin-colored, designed to make the face appear uniform in color and texture)

   Synonyms: make-up, podkład

   Hypernym: kosmetyk

2. (electricity, historical) fluid (continuous, weightless substance that was formerly identified with or considered the essence of electricity, heat, and magnetism)

   Hypernym: substancja

3. (chiefly in the plural, occult) fluid (mysterious energy that can be transmitted through living organisms, objects, and places, and then received by others, affecting the environment and the atmosphere in it)

Declension

Related terms

Further reading

• fluid in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• fluid in Polish dictionaries at PWN

Romanian

Etymology

Borrowed from French fluide, from Latin fluidus.

Adjective

fluid m or n (feminine singular fluidă, masculine plural fluizi, feminine and neuter plural fluide)

1. fluid

Declension

Related terms

• fluiditate

Serbo-Croatian

Pronunciation

• IPA^(key): /flûiːd/
• Hyphenation: flu‧id

Noun

flȕīd m (Cyrillic spelling флу̏ӣд)

1. fluid

Declension

Spanish

Verb

fluid

1. second-person plural imperative of fluir