different between fluctuate vs fluid

English

Etymology

Borrowed from Latin fluctuo, fluctuatus.

Verb

fluctuate (third-person singular simple present fluctuates, present participle fluctuating, simple past and past participle fluctuated)

1. (intransitive) To vary irregularly; to swing.
2. (intransitive) To undulate. (Can we add an example for this sense?)
3. (intransitive) To be irresolute; to waver.

   I fluctuated between wishing he was back home and wishing I'd never met him.

4. (transitive) To cause to vary irregularly.

Related terms

• fluctuant

Translations

Latin

Verb

fl?ctu?te

1. second-person plural present active imperative of fl?ctu?

English

Etymology

From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin flu? (“to flow”), from Proto-Indo-European *b?leh?- (“to swell; surge; overflow; run”). Akin to Ancient Greek ?????? (phlúein, “to swell; overflow”). Not related to English flow, which is a native, inherited word from *plew-.

Pronunciation

• IPA^(key): /?flu??d/
• (obsolete) IPA^(key): /?flju??d/
• Rhymes: -u??d

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).
   • 1992, Christopher G. Morris, Academic Press, Christopher W. Morris, Academic Press Dictionary of Science and Technology, Gulf Professional Publishing (?ISBN), page 854:

     fluid inclusion Petrology, a tiny fluid- or gas-filled cavity in an igneous rock. 1-100 micrometers in diameter, formed by the entrapment of a fluid, typically that from which the rock crystallized.

   • 2006, Jörg Fitter, Thomas Gutberlet, Neutron Scattering in Biology: Techniques and Applications, Springer Science & Business Media (?ISBN), page 236:

     For studying interfaces between solid and another solid, fluid, or gas, a sample can be oriented with its reflecting surface(s) vertical (and with the scattering plane, as defined by nominal incident and reflected wavevectors, horizontal).

   • 2011, Andrew T Raftery, Michael S. Delbridge, Marcus J. D. Wagstaff, Churchill's Pocketbook of Surgery, International Edition E-Book, Elsevier Health Sciences (?ISBN), page 11:

     Tenderness: is the lump tender?

     Composition: is the mass solid, fluid or gas?

   • 2012, Will Pettijohn P.E.C., Oil & Gas Handbook: A Roughneck's guide to the Universe, AuthorHouse (?ISBN), page 23:

     The choke manifold then expels the fluid or gas to the gas buster or a panic line. The panic line will then either send the fluid or gas to the reserve pit or a flare stack or flare tank.

   • For more quotations using this term, see Citations:fluid.
3. (specifically, medicine, colloquial, typically in the plural) Intravenous fluids.

Derived terms

• amber fluid
• brake fluid
• fluid mechanics
• superfluid

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

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, G. & C. Merriam, 1913.
• fluid in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• fluid at OneLook Dictionary Search

Catalan

Adjective

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

1. fluid

Derived terms

• fluïdesa

Noun

fluid m (plural fluids)

1. fluid

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.
• “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 (not comparable)

1. fluid

Declension

Synonyms

• flüssig

Further reading

• “fluid” in Duden online

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.

Romanian

Etymology

From French fluide, from Latin fluidus.

Adjective

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

1. fluid

Declension

Related terms

• fluiditate

Serbo-Croatian

Pronunciation

• IPA^(key): /flûi?d/
• Hyphenation: flu?id

Noun

fl??d m (Cyrillic spelling ??????)

1. fluid

Declension

Spanish

Verb

fluid

1. (Spain) Informal second-person plural (vosotros or vosotras) affirmative imperative form of fluir.