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 ?
Variations in brightness are apparent to the careful visual observer who checks it on a regular basis but, unlike most of the other known variable nebulae, it never completely fades and is always detectable in mid-size scopes.
There are thousands of planetary nebulae in our Galaxy alone, and they provide targets for professional and amateur astronomers alike, with the latter often taking spectacular images of these beautiful objects.
That is because the sun is a solitary star, lacking a nearby companion that twisted the nebulae displayed Tuesday into their fantastic shapes.
Lupus hosts a complex region of sky just west of the center of the galaxy that contains extensive dark nebulae similar to the more northerly region of the Great Rift.
While stars are spherical, many of these planetary nebulae are strikingly complex, with knots, filaments, and intense jets of material forming intricate patterns.
Andrea Tasselli is one of the leading exponents in the country of imaging planetary nebulae and his image on the previous page through an Intes Micro M809 (20cm f/10 Mak-Cass) with SXVH9 CCD shows tremendous detail.
But unlike giant emission nebulae such as the Orion Nebula (M42), they don't glow from the ionization of hydrogen.
Even though it is several times further away than the Orion Nebula, its apparent size on the sky is therefore about the same, making it also one of the largest nebulae in the sky.
The Section has a programme to monitor all variable nebulae.
Our observations provide some insights into the likelihood of finding shocks around other pulsars and the use of nebulae to find high-velocity neutron stars either not acting as pulsars or with their radiation beamed away from the Earth," the researchers note.
These pillars might look dense, but the clouds of dust and gas which make up nebulae are actually very diffuse.
I find MSA to be the best atlas to use when observing dark nebulae.