fluid

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fluid,

any substance that is able to flow. Of the four states of matterstates of matter,
forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed.
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, only a solidsolid,
one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from liquid and gas, in which a substance has both a definite shape and a definite volume.
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 is not a fluid, since it has a definite shape that is not readily changed. Any liquidliquid,
one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from solid and gas, in which a substance has a definite volume but no definite shape.
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, gasgas,
in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liquids, gases are fluids and assume the shape of their containers.
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, or plasmaplasma,
in physics, fully ionized gas of low density, containing approximately equal numbers of positive and negative ions (see electron and ion). It is electrically conductive and is affected by magnetic fields.
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 is classed as a fluid.

fluid

[′flü·əd]
(physics)
An aggregate of matter in which the molecules are able to flow past each other without limit and without fracture planes forming.

fluid

1. a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
2. capable of flowing and easily changing shape
References in periodicals archive ?
The bulk of prostatic fluid is created in and secreted from the outermost region of the prostate gland, the so-called "peripheral zone," which is also the source of most prostate cancer development and progression.
The prostate makes and secretes prostatic fluid, one of the five major fluids that make up semen.
The prostate gland is responsible for secreting prostatic fluid, which is a major component of the male seminal fluid that increases sperm mobility and lubricates the urethra to prevent infection.
Regular release of prostatic fluid may also enhance immune surveillance of tumor cells.
In studies conducted at Stanford University 20 years ago, Fair found that men with BPH or inflammatory prostatitis (the most common type) didn't have any less zinc in their prostatic fluid than men without prostate trouble.