• WordNet 3.6
    • adj fluid subject to change; variable "a fluid situation fraught with uncertainty","everything was unstable following the coup"
    • adj fluid affording change (especially in social status) "Britain is not a truly fluid society","upwardly mobile"
    • adj fluid in cash or easily convertible to cash "liquid (or fluid) assets"
    • adj fluid smooth and unconstrained in movement "a long, smooth stride","the fluid motion of a cat","the liquid grace of a ballerina"
    • adj fluid characteristic of a fluid; capable of flowing and easily changing shape
    • n fluid continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
    • n fluid a substance that is fluid at room temperature and pressure
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Boiled grape juice was the fluid used as a lubricant for the first contact lenses. Eugene Flick, who invented contact lenses in 1887, chose boiled grape juice over sugar water to lubricate the thick glass lenses that covered the entire eye.
    • n Fluid A fluid substance; a body whose particles move easily among themselves.Fluid is a generic term, including liquids and gases as species. Water, air, and steam are fluids. By analogy, the term was sometimes applied to electricity and magnetism, as in phrases electric fluid, magnetic fluid, though not strictly appropriate; such usage has disappeared.
    • a Fluid flū"ĭd Having particles which easily move and change their relative position without a separation of the mass, and which easily yield to pressure; capable of flowing; liquid or gaseous.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: During warm weather, hippos secrete a reddish, oily fluid, called pink sweat, which acts as a skin conditioner to keep it moist.
    • fluid Capable of flowing; liquid or gaseous; consisting of a substance incapable of resisting forces (tangential stresses) tending to change its shape.
    • fluid Not fixed or rigid; flowing; shifting; fluent.
    • n fluid A substance which flows or is capable of flowing; a substance which is incapable of resisting forces (tangential stresses) tending to change its shape without altering its size. A fluid has absolutely no tendency to spring back to its original shape when distorted, except in virtue of a surface tension. A perfect fluid is a fluid in which a bending stress produces an instantaneous strain—that is to say, there is no delay in taking a form of equilibrium, except what is due to the masses of the particles: opposed to a viscous fluid, in which the yielding is not instantaneous, and to a plastic solid, which yields instantaneously to a sufficient, but not to a very small, stress. Fluids are divided into liquids and gases or vapors. Gases or elastic fluids tend to expand indefinitely while preserving their homogeneity; liquids or inelastic fluids tend to expand indefinitely, but only by evaporation—that is, by separating into two parts with a bounding surface between them. (See liquid, gas, and ether.) In the early history of physical science the phenomena of heat, electricity, and magnetism were supposed to be due to the motions of peculiar imponderable fluids; hence the expressions north and south magnetic fluid, the electrical fluid, etc., which still linger (but not with good writers), though the explanation of the phenomena has changed with the advance of knowledge.
    • n fluid Some hypothetical supersensible substance conceived as analogous to known fluids. See fluidism.
    • n fluid See the adjectives.
    • n fluid See the adjectives.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: In a University of Arizona study, rails and armsrests in public buses were found to be contaminated by the highest concentration of bodily fluids.
    • adj Fluid flōō′id that flows, as water: liquid or gaseous
    • n Fluid a substance in which the particles can move about with greater or less freedom from one part of the body to another
    • ***


Webster's Revised Unabridged Dictionary
L. fluidus, fr. fluere, to flow: cf. F. fluide,. See Fluent


In literature:

But we have a life fluid of our own, and knowing our Joanie, she'll want it used both ways.
"The Alembic Plot" by Ann Wilson
Fifth, pelvis, with its great supply of nerves, blood and other fluids.
"Philosophy of Osteopathy" by Andrew T. Still
If ruptured, the rete is exposed, but the skin soon regains its normal condition; if undisturbed, the fluid usually disappears by absorption.
"Essentials of Diseases of the Skin" by Henry Weightman Stelwagon
Wananda will give you the fluid to inject into her veins.
"Valley of the Croen" by Lee Tarbell
The subjects are kept in a slate tank filled with the fluid.
"Practical Taxidermy" by Montagu Browne
It is protected by a distasteful fluid.
"Ontario Teachers' Manuals: Nature Study" by Ontario Ministry of Education
It dislikes what is fluid, and solidifies everything it touches.
"Creative Evolution" by Henri Bergson
A single cup of this miraculous fluid, and his depression was vanquished as no argument could have vanquished it.
"Virginia" by Ellen Glasgow
The spores are black, and the gills turn into a black fluid at the last.
"Girl Scouts in the Adirondacks" by Lillian Elizabeth Roy
Hypochondria, in its various phases, results from the premature and unnatural waste of the seminal fluid.
"The Ladies Book of Useful Information" by Anonymous

In poetry:

Welcome!--I hail you to my glass:
All welcome, here, you find;
Here let the cloud of trouble pass,
Here, be all care resigned.--
This fluid never fails to please,
And drown the griefs of men or bees.
"On A Honey Bee" by Philip Morin Freneau
Welcome!—I hail you to my glass:
All welcome, here, you find;
Here let the cloud of trouble pass,
Here, be all care resigned.—
This fluid never fails to please,
And drown the griefs of men or bees.
"To A Honey Bee" by Philip Morin Freneau
This is the fluid in which we meet each other,
This haloey radiance that seems to breathe
And lets our shadows wither
Only to blow
Them huge again, violent giants on the wall.
One match scratch makes you real.
"By Candlelight" by Sylvia Plath
O what is it in me that makes me tremble so at voices?
Surely, whoever speaks to me in the right voice, him or her I shall
As the water follows the moon, silently, with fluid steps, anywhere
around the globe.
"Voices" by Walt Whitman
O I cannot explain what happened to them!
They are proper in shape and number and every part.
They sit so nicely in the pickling fluid!
They smile and smile and smile at me.
And still the lungs won't fill and the heart won't start.
"Stillborn" by Sylvia Plath
What is called good is perfect, and what is called bad is just as
The vegetables and minerals are all perfect, and the imponderable
fluids are perfect;
Slowly and surely they have pass'd on to this, and slowly and surely
they yet pass on.
"To Think Of Time" by Walt Whitman

In news:

Suspecting an infection, the fawn was started on antibiotics and fluid therapy.
Valcor Scientific offers a family of general-purpose solenoid valves for a range of fluid control solutions.
Applications of Reservoir Fluid Geochemistry .
Rich in fluids, Orange County.
Items Tagged with ' glycol /fluid cooled heat exchangers'.
Some seem to look better than others because they may be more rhythmic and fluid.
) is more fluid than we are often comfortable admitting.
Is water in your hydraulic fluid.
For three months, I would haggle everything that came my way, insisting to everyone who would listen that price was a fluid force, a matter of argument.
As we often claim, fluid power helps to make our world work.
Raid Account, Hastily Told, Proves Fluid.
Features include onboard DMX, low fluid sensor, auto timers, and continuous self-cleaning.
ThermaPAVER is a modular heat exchanger panel that evenly distributes a heating and cooling transfer fluid (glycol or water) through turbulent flow channels to allow for even, efficient energy transfer across the entire panel surface.
In Operational Smoothness, Pichler said the hinge was smooth and the rotating arm was fluid.
If you can so fluidly make a prison look like an office building -- the St Louis County Justice Center in downtown Clayton, for example -- then what doesn't look like a prison.

In science:

Ruelle D., Characteristic Exponents for a Viscous Fluid Sub jected to Time-Dependent Forces, Comm.
Existence and homogenization of the Rayleigh-B\'enard problem
Landau, L. D., & Lifshitz, E. M. 1986, Fluid Mechanics, Pergamon press (Oxford).
A Moderate Cluster Cooling Flow Model
Because <|x|> → with increasing force, a distinction between these two measures of extension is not necessary for the present purpose. As expected, in the limit of zero force (fluid velocity), <|x|>o = o /2 ~ Rg.
Entropic Elasticity of Weakly Perturbed Polymers
Israel W 1988 in Covariant Fluid Mechanics and Thermodynamics: An Introduction, A.
A Conserved Bach Current
Even for a fluid there are properties that cannot be conserved - see Appendix).
The Energy-Entropy Principle