opacity


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opacity

 [o-pas´ĭ-te]
1. the condition of being opaque.
2. an opaque area.

o·pac·i·ty

(ō-pas'i-tē),
1. A lack of transparency; an opaque or nontransparent area.
2. On a radiograph, a more transparent area is interpreted as an opacity to x-rays in the body.
3. Mental dullness.
[L. opacitas, shadiness]

opacity

/opac·i·ty/ (o-pas´it-e)
1. the condition of being opaque.
2. an opaque area.

opacity

[ōpas′itē]
Etymology: L, opacitus, shadiness
pertaining to an opaque quality of a substance or object, such as cataract opacity.

opacity

Medtalk A clouded or opaque area. See Corneal opacity.

o·pac·i·ty

(ō-pas'i-tē)
1. A lack of transparency; an opaque or nontransparent area.
2. On a radiograph, a more transparent area is interpreted as an opacity to x-rays in the body.
3. Mental dullness.
[L. opacitas, shadiness]

opacity 

The condition of a tissue or structure which is not transparent, or being opaque. The location of an opacity within the eye can be determined with a slit-lamp. It can also be determined using an ophthalmoscope and asking the patient to look up or down. If the opacity moves very little, or not at all, it is situated in the lens. If the opacity moves in the same direction as the eye it is situated in front of the lens and if it moves in the opposite direction it is situated in the vitreous humour. See cataract; muscae volitantes; corneal ulcer.

o·pac·i·ty

(ō-pas'i-tē)
1. On a radiograph, a more transparent area is interpreted as an opacity to x-rays in the body.
2. A lack of transparency.
[L. opacitas, shadiness]

opacity

1. the condition of being opaque, e.g. corneal opacity, lenticular opacity.
2. an opaque area.
3. radiopacity is the capacity of a substance to absorb radiation, rather than permit its passage.
References in periodicals archive ?
Previous studies have employed a large number of opacity proxies.
Corneal ulcers and corneal opacity contribute highest incidence in corneal affection in dogs.
Ground-based observations of opacity, although scarcer than from orbit, are very important because the retrieval process incorporates fewer assumptions than from orbit and thus the uncertainty in the results is lower, providing "ground truth" and complementary information for the analysis of satellite measurements.
As compared to other possible variants, the structure of model (1) corresponds to the nature of transient period under consideration better: in case of long duration of the transient process, the second summand approaches zero, and evaluation of opacity approaches its value in the set mode at a maximum shaft speed [D.
Figure 4 shows the opacity and particle size results obtained with DETA.
Another factor to consider for maximizing opacity is optimum dispersion of the pigment particles in the paint.
One way of increasing the opacity of calcium carbonate is to increase its reflection, which can be achieved by understanding the surface area.
Stellar opacity involves the removal of energy from a beam of photons originating in the core of the Sun through four mechanisms: 1) bound-bound, 2) bound-free, 3) free-free, and 4) scattering processes (see [41, p.
Testing to demonstrate compliance with the opacity limit is required no less frequently than every six months and each time you make a process change likely to increase fugitive emissions [63.
This is a remarkable polygonal pattern of white or grey opacity in the cornea that is visible on direct illumination (figure 3).
One module checks the base for soiling, damage, opacity, and thickness plus the position and size of the injection gate.