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the Crab Nebula, photographed by the Hubble Space Telescope in 2005


n. pl. neb·u·lae (-lē′) or neb·u·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.

[Middle English nebule, cloud, mist, from Latin nebula; see nebh- in Indo-European roots.]

neb′u·lar adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.nebular - of or relating to or resembling a nebula; "the nebular hypothesis of the origin of the solar system"
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
2.nebular - resembling a cloud
cloudy - full of or covered with clouds; "cloudy skies"