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fluid

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UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈfluːɪd/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈfluɪd/ ,USA pronunciation: respelling(flo̅o̅id)


WordReference Random House Learner's Dictionary of American English © 2026
flu•id /ˈfluɪd/USA pronunciation   n. 
  1. Hydraulics, Physicsa substance, such as a liquid or gas, that is capable of flowing and that changes its shape when acted upon by a force: [uncountable]Fluid dripped from the tank.[countable]to drink fluids.

adj. 
  1. Hydraulicsflowing or capable of flowing:a fluid substance.
  2. changing easily or readily; not fixed, stable, or rigid:Our plans are fluid.
  3. smooth and flowing:a dancer with fluid gestures.
  4. Businessconvertible into cash;
    liquid:fluid assets.
flu•id•i•ty /fluˈɪdɪti/USA pronunciation  n. [uncountable]
flu•id•ly, adv. See -flu-.

WordReference Random House Unabridged Dictionary of American English © 2026
flu•id  (flo̅o̅id),USA pronunciation n. 
  1. Hydraulics, Physicsa substance, as a liquid or gas, that is capable of flowing and that changes its shape at a steady rate when acted upon by a force tending to change its shape.

adj. 
  1. Hydraulicspertaining to a substance that easily changes its shape;
    capable of flowing.
  2. Hydraulicsconsisting of or pertaining to fluids.
  3. changing readily;
    shifting;
    not fixed, stable, or rigid:fluid movements.
  4. convertible into cash:fluid assets.
  • Latin fluidus, equivalent. to flu(ere) to flow + -idus -id4
  • 1595–1605
fluid•al, adj. 
fluid•ly, fluid•al•ly, adv. 
fluid•ness, n. 
    2. See liquid. 

Collins Concise English Dictionary © HarperCollins Publishers::
fluid /ˈfluːɪd/ n
  1. a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
adj
  1. capable of flowing and easily changing shape
  2. of, concerned with, or using a fluid or fluids
  3. constantly changing or apt to change
  4. smooth in shape or movement; flowing
Etymology: 15th Century: from Latin fluidus, from fluere to flowˈfluidness n
'fluid' also found in these entries (note: many are not synonyms or translations):
Collocations: stir until (it is) fluid, his lungs are filled with fluid, [ten] fluid ounces, more...

🗣️Forum discussions with the word(s) "fluid" in the title:

a pad of fluid
acceleration following a fluid particle
An object full of slimy fluid exploding out under pressure
blinker fluid
by drawing energy <from shear> in the surrounding fluid (Physics)
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drip in fluid from the swamp
entering a leaving fluid thermistors before welding
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fluid mechanics <issues?> involved in engineering projects.
fluid ounces <of> flour
fluid social
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fluid strength
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from <shear> in the surrounding fluid
He’d drain the embalming fluid off his dead grandma
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