Definition of nebula

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< Nebuchadnezzar II

nebular hypothesis >

neb·u·la    (nby-l) KEY  

NOUN:
pl. neb·u·lae   (-l) KEY   or neb·u·las

1. Astronomy
   1. A diffuse mass 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 radiation.
   2. See galaxy.
2. Pathology
   1. A cloudy spot on the cornea.
   2. Cloudiness in the urine.
3. A liquid medication applied by spraying.

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ETYMOLOGY:
Middle English nebule, cloud, mist, from Latin nebula; see nebh- in Indo-European roots

OTHER FORMS:
nebu·lar (Adjective)

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