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 ?
Fat cells act like a sponge because they attract water and excess fat can lead to high fluid retention.
It's obvious that I do have allergic fluid retention, but I won't be sticking to the diet.
If, however, the fluid retention has been noticed on a cyclical basis - related to pre-menstrual syndrome, then Agnus Castus is a more specific herb for relief.
By drinking about eight glasses of water a day, you'll flush toxins out your system, curb your appetite, have more energy and reduce fluid retention.
Scrap salt, too, as this can lead to fluid retention.
And varicose veins can cause fluid retention in your legs and ankles.
Water or fluid retention results when the body's water balance is out of kilter.
However, with the extra heat and sunshine, a substantial number of people suffer terribly from fluid retention.
Aristolochia, used to treat fluid retention and rheumatism, will not be sold for three months The Medicines Control Agency will then decide if a permanent ban is needed.