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fluid

[ floo-id ]
/ ˈflu ɪd /
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noun
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
pertaining to a substance that easily changes its shape; capable of flowing.
consisting of or pertaining to fluids.
changing readily; shifting; not fixed, stable, or rigid:fluid movements.
convertible into cash: fluid assets.
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Origin of fluid

First recorded in 1595–1605; from Latin fluidus, equivalent to flu(ere) “to flow” + -idus adjective suffix; see -id4

synonym study for fluid

2. See liquid.

OTHER WORDS FROM fluid

WORDS THAT MAY BE CONFUSED WITH fluid

fluid , gas, liquid (see synonym study at liquid)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fluid in a sentence

British Dictionary definitions for fluid

fluid
/ (ˈfluːɪd) /

noun
a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
adjective
capable of flowing and easily changing shape
of, concerned with, or using a fluid or fluids
constantly changing or apt to change
smooth in shape or movement; flowing

Derived forms of fluid

fluidal, adjectivefluidness, nounfluidly or fluidally, adverb

Word Origin for fluid

C15: from Latin fluidus, from fluere to flow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for fluid

fluid
[ flōōĭd ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for fluid

fluid

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

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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