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1. slight corneal opacity.
2. an oily preparation for use in a nebulizer.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

neb·u·la (nebul.),

, pl.


(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]
Farlex Partner Medical Dictionary © Farlex 2012


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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


, pl. nebulae (neb'yū-lă, -lē)
1. A translucent foglike opacity of the cornea.
2. A spray.
[L. fog, cloud, mist]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


A cloudy spot on the CORNEA of the eye. A central nebula can severely interfere with clear vision.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Destaca-se, tambem, a presenca constante de nuvens, caracterizando-as como florestas nebulares. Na area "Estagio Avancado 2" existe, ainda, a presenca de um pequeno curso d'agua (cerca de 50 cm de largura).
At these epochs the SN spectrum is nebular, showing emission lines mostly of forbidden transitions.
Ossified part of ear canal attachment is separated with the help of bone nebular. Carefully blunt incision was then given to separate ear canal attachment with tympanic cavity.
3) Pierre Simon, Marquis de Laplace (17491827) offers him the nebular hypothesis (according to which the Solar System originates from a cloud of cosmic gas--this being an attempt to scientifically formalize the nebular theory proposed earlier by Emanuel Swedenborg and Immanuel Kant; cf.
Perhaps a nebular filter would help one spot it and make the task slightly easier.
NEBULAR The constellation of Orion offers some stunning viewing
They arose in the nebular gases of the proto-Solar System.
secundum is located on trunks, 2m above the soil at the edge of the nebular forest, in more luminous sites.
The nebular loop has a diameter of around 3[degrees], so a wide field is needed to capture it in its entirety.
At RH values greater than 50%, the membrane changed from clear to nebular. The expected loss of transparency is probably related to the vapor-induced phase separation occurred on membrane surface.
The teams, named Apollo and Nebular, each had a team leader who took on the project manager role and oversaw decisions for the mock businesses.