[ floo-id ]
/ ˈflu ɪd /
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.
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.
gender-fluidRead more in this article about some frequently asked questions and fun facts related to our definitions.
Origin of fluid
1595–1605; < Latin fluidus, equivalent to flu(ere) to flow + -idus -id4
SYNONYMS FOR fluid
2 See liquid.
flu·id·al, adjectiveflu·id·ly, flu·id·al·ly, adverbflu·id·ness, nounnon·flu·id, noun
non·flu·id·ly, adverbun·flu·id, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for fluidness
/ (ˈfluːɪd) /
a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
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 Formsfluidal, 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
Medicine definitions for fluidness
[ flōō′ĭd ]
An amorphous substance whose molecules move freely past one another; a liquid or gas.
Of or characteristic of a fluid.
Related formsflu•id′i•ty (-ĭd′ĭ-tē) null n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for fluidness
[ flōō′ĭd ]
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.
Culture definitions for fluidness
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.