nebula

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nebula

 [neb´u-lah]
1. slight corneal opacity.
2. an oily preparation for use in a nebulizer.

neb·u·la (nebul.),

, pl.

neb·u·lae

(neb'yū-lă, -lē),
1. A translucent foglike opacity of the cornea.
2. A class of oily preparations, intended for application by atomization.
3. A spray.
[L. fog, cloud, mist]

nebula

/neb·u·la/ (neb´u-lah) pl. ne´bulae   [L.]
1. a slight corneal opacity.
2. a preparation, particularly an oily preparation, for use in a nebulizer.

nebula

(nĕb′yə-lə)
n. pl. nebu·lae (-lē′) or nebu·las
1. Astronomy
a. A diffuse cloud of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident light or emits its own light.
b. A galaxy. No longer in technical use.
2. Medicine
a. A cloudy spot on the cornea.
b. A liquid preparation for use in a nebulizer.

neb′u·lar adj.

nebula

[neb′yələ] pl. nebulae
Etymology: L, cloud
1 a slight corneal opacity or scar that seldom obstructs vision and that can be seen only by oblique illumination.
2 a murkiness in the urine.
3 an oily concoction that is applied with an atomizer.
4 mass of interstellate dusts.

neb·u·la

, pl. nebulae (neb'yū-lă, -lē)
1. A translucent foglike opacity of the cornea.
2. A spray.
[L. fog, cloud, mist]

nebula

A cloudy spot on the CORNEA of the eye. A central nebula can severely interfere with clear vision.

leukoma

Dense, white, corneal opacity caused by scar tissue. A localized leukoma appears as a whitish scar surrounded by normal cornea. A generalized leukoma involves the entire cornea, which appears white, often with blood vessels coursing over its surface. Visual impairment depends on the location and extent of the leukoma. If the opacity is faint, it is called a nebula. Note: also spelt leucoma. See hyperacuity; corneal ulcer.

nebula

1. a slight corneal opacity.
2. an oily preparation for use in an atomizer.
References in periodicals archive ?
In one study, led by Dr Isabel Aleman of the University of Leiden, the Netherlands, 11 planetary nebulas were analysed and the molecule was found in just three.
Although I was certain of its exact location, the planetary nebula Abell 79 remained invisible through my 10-inch scope, with or without filters.
A planetary nebula is formed when a massive star is at its end stage and dies as white dwarf, after which it ejects most of its atmosphere into the space, explained ESO.
3 ( ANI ): Astronomers have successfully synthesized the distribution of atomic carbon around a planetary nebula NGC 6302 in test observations with the ALMA Band 8 receiver.
and even that globular does look just like a planetary nebula in all but very powerful instruments.
Astronomers have for the first time caught one of these dying stars at the very beginning of this brief, shining period, when it's known as a planetary nebula.
The PPN are a short-duration phase of stellar evolution that precedes the planetary nebula phase.
This planetary nebula, located roughly 5,000 light-years away in the Vela constellation, is host to a hot, massive dying star that is rapidly disintegrating, losing its mass.
NGC 2392, nicknamed the "Eskimo Nebula," is what astronomers call a planetary nebula.
One of the more difficult Messier objects, the planetary nebula M97 can be a tricky target from light polluted skies, and unless a large telescope is used it often appears as a faint grey disk with only the vaguest hints of any detail within.
Scientists were recently able to get a good look at one dying star, planetary nebula NGC 2392, capturing it in a pretty radiant composite image.
In the 1950s the planetary nebula KjPn8 was discovered on Palomar Observatory Sky Survey plates.