American Heritage® Dictionary of the English Language, Fourth Edition
- 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. Of, relating to, or characteristic of a fluid.
- adj. Readily reshaped; pliable.
- adj. Smooth and flowing; graceful: the fluid motion of a cat.
- adj. Changing or tending to change; variable: a fluid situation fraught with uncertainty.
- adj. Characterized by or allowing social mobility: a fluid society.
- adj. Convertible into cash: fluid assets.
Century Dictionary and Cyclopedia
- Capable of flowing; liquid or gaseous; consisting of a substance incapable of resisting forces (tangential stresses) tending to change its shape.
- Not fixed or rigid; flowing; shifting; fluent.
- n. 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. Some hypothetical supersensible substance conceived as analogous to known fluids. See fluidism.
- n. See the adjectives.
- n. See the adjectives.
- n. physics Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma
- adj. not comparable Of, or relating to fluid.
- adj. In a state of flux; subject to change.
- adj. Moving smoothly, or giving the impression of a liquid in motion.
- adj. of an asset Convertible into cash.
GNU Webster's 1913
- adj. 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.
- n. A fluid substance; a body whose particles move easily among themselves.
- adj. in cash or easily convertible to cash
- n. a substance that is fluid at room temperature and pressure
- n. continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
- adj. subject to change; variable.
- adj. affording change (especially in social status)
- adj. characteristic of a fluid; capable of flowing and easily changing shape
- adj. smooth and unconstrained in movement
- From Middle English, flowing, from Old French fluide, from Latin fluidus, from fluere, to flow. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Around each joint has grown up a strong sheath of tough, fibrous tissue to hold the bones together; and, inside this, between the heads of the bones, is a very delicate little bag, or pouch, containing a few drops of smooth, slippery fluid (_synovial fluid_) to lubricate the movements of the joint.”
“As the layers become continuous with each other at different points, the arachnoid, like the pericardium, forms a shut sac, and, like other serous membranes, it secretes a fluid, known as the _arachnoid fluid_.”
“Moving over matter which has the qualities that we denote by the term fluid, the swayings which the air produces are of a peculiar sort, though they much resemble those of the fiddle string.”
“Does anyone know if the smell of the fluid is an issue?”
“These are usually considered low risk procedures, but the risk depends on where the fluid is and how sick your child is at the time.”
“If a large amount of fluid is present, abnormal cells may be detected by cytology if this fluid is aspirated with a syringe.”
“Leroy, at this point, of course the crew has done what they call fluid loading.”
“To some that makes it clear why President Fox says he wants a convergence of our economies and what he calls a fluid border.”
“This preparation, which I call a fluid extract, represents virtually equal parts by weight of the dried plants.”
“Some of them will be seen to possess the qualities of ink, and the name fluid is evidently given to meet the commercial demand for fluids.”
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Looking for tweets for fluid.