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 ?
Harvested virus from allantoic fluid agglutinated chicken RBCs with a titer of 1:256 and also reacted with NDV specific antiserum confirming that the virus belonged to AMPV-1 group of NDVs.
In hydrallantois, accumulation of allantoic fluid was rapid due to placental abnormalities and possible interference with sodium metabolism at cellular level (Jackson, 1980).
None of the embryos died until day 7 postinoculation when the eggs were chilled at 4[degrees]C, the allantoic fluid was collected, and the embryos were examined for gross pathologic changes.
After 18 hrs of dilation therapy, cervix was properly dilated and allantoic cavity (water bag) ruptured and about 45-50 liters of allantoic fluid escaped out from birth canal.
The infective allantoic fluid was later used for pathotyping of isolates by employing biological characterization tools.
In their progeny embryos, IgA, IgG, and IgM antibodies to these Mycoplasma species were detected in the allantoic fluid (ALF) and amniotic fluid (AMF) on day 14 of embryonic development (ED).
The chicken embryo died within 2-5 days post inoculation and showing IBV specific lesions were harvested allantoic fluid and 50% chicken infectious dose (EID50) was calculated 103 EID50 by inoculation of serial 10 fold dilution of virus in 10-day-old SPF embryonated chicken eggs.
Rupture of fetal membranes resulted in 90-100 liters of amber colored allantoic fluid gushing from uterus which confirmed our diagnosis as hydroallantois.
Allantoic fluid from the injected eggs agglutinated 0.
The virus presence in allantoic fluid was checked by rapid HA (haemagglutination) test (Allan and Gough, 1974) using 5% RBCs suspension.
Fresh infective allantoic fluid obtained after passaging the AIV H9N2 in embryonated eggs with a HA titer greater than 1/16 was diluted 1/10 in sterile isotonic saline.