nebula

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.

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neb·u·la (nby-l)

n. pl. neb·u·las or neb·u·lae (-l)

1. A faint, foglike opacity of the cornea.

2. A class of oily preparations for use in a nebulizer.

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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.

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nebula

1. a slight corneal opacity.

2. an oily preparation for use in an atomizer.

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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.