flu·id

[floo-id]
noun
1.
a 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.
adjective
2.
pertaining to a substance that easily changes its shape; capable of flowing.
3.
consisting of or pertaining to fluids.
4.
changing readily; shifting; not fixed, stable, or rigid: fluid movements.
5.
convertible into cash: fluid assets.
00:10
Fluid is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.

Origin:
1595–1605; < Latin fluidus, equivalent to flu(ere) to flow + -idus -id4

flu·id·al, adjective
flu·id·ly, flu·id·al·ly, adverb
flu·id·ness, noun
non·flu·id, noun
non·flu·id·ly, adverb
un·flu·id, adjective

fluid, gas, liquid (see synonym study at liquid).


2. See liquid.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
fluid (ˈfluːɪd) [Click for IPA pronunciation guide]
 
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
2.  capable of flowing and easily changing shape
3.  of, concerned with, or using a fluid or fluids
4.  constantly changing or apt to change
5.  smooth in shape or movement; flowing
 
[C15: from Latin fluidus, from fluere to flow]
 
'fluidal
 
adj
 
'fluidness
 
n
 
'fluidly
 
adv
 
'fluidally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

fluid
c.1600, from L. fluidus "fluid, flowing," from fluere "to flow" (see fluent). The noun is 1660s, from the adj.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fluid flu·id (fl&oomacr;'ĭd)
n.
An amorphous substance whose molecules move freely past one another; a liquid or gas. adj.
Of or characteristic of a fluid.


flu·id'i·ty (-ĭd'ĭ-tē) or flu'id·ness n.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fluid   (fl'ĭd)  Pronunciation Key 
A state of matter, such as liquid or gas, in which the component particles (generally molecules) can move past one another. Fluids flow easily and conform to the shape of their containers. See also state of matter, viscosity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary

fluid definition


In physics, a substance that flows — usually a liquid or a gas.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences
Windshield washer fluid is a brightly colored liquid made of methanol, a
  poisonous alcohol.
Lighter fluid is a flammable liquid found in cigarette lighters and other types
  of lighters.
What caught his eye was a small red gem of urinal cake, which had been tumbled
  and abraded into a perfect, fluid-winnowed capsule.
Even before you were born, she was exposing you to different flavors in the
  womb via amniotic fluid.
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