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Fluid

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flu⋅id

  [floo-id]
Use Fluid in a Sentence
–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.
Origin:
1595–1605; < L fluidus, equiv. to flu(ere) to flow + -idus -id 4

Related forms:
flu⋅id⋅al, adjective
flu⋅id⋅ly, flu⋅id⋅al⋅ly, adverb
flu⋅id⋅ness, noun

Synonyms:
2. See liquid.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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flu·id   (flōō'ĭd)   
n.  A continuous, amorphous substance whose molecules move freely past one another and that has the tendency to assume the shape of its container; a liquid or gas.
adj.  

  1. Of, relating to, or characteristic of a fluid.

  2. Readily reshaped; pliable.

  3. Smooth and flowing; graceful: the fluid motion of a cat.

    1. Changing or tending to change; variable: a fluid situation fraught with uncertainty.

    2. Characterized by or allowing social mobility: a fluid society.

  5. Convertible into cash: fluid assets.


[From Middle English, flowing, from Old French fluide, from Latin fluidus, from fluere, to flow; see bhleu- in Indo-European roots.]
flu·id'i·ty (-ĭd'ĭ-tē), flu'id·ness n., flu'id·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

fluid

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.
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Word Origin & History

fluid  (adj.)
1603, from L. fluidus "fluid, flowing," from fluere "to flow" (see fluent). The noun is 1661, from the adj.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: 1flu·id
Pronunciation: 'flü-&d
Function: adjective
: having particles that easily move and change their relativeposition without a separation of the mass and that easily yield to pressure : capable of flowing

Main Entry: 2fluid
Function: noun
: a substance (as a liquid or gas) tending to flow or conform to the outline of its container; specifically : one in the body of an animal or plant —see CEREBROSPINAL FLUID, SEMINAL FLUID
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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