RESEARCH A WORD

nebula is a common noun.  Its 3 syllables, neb u la, are pronounced NEB yu la.  There are 3 definitions.

Definition 1 in Astronomy is:  Any luminous cloud-like object in the sky, as a distant star-cluster; any gaseous body of unorganized stellar substance.  Source:  Practical Standard Dictionary

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Associations with the noun nebula, Definition 1, are:

Editor's note:  Need a picture of Rosette Nebula, an emission nebula.

emission nebula:  One that emits light due to the action of ultraviolet radiation on its gas atoms; as the Trifid Nebula.

Tarantula Nebula:

open clusters:  Loose groups of a few thousand young stars that were born in the same cloud and are drifting apart.

globular clusters:  Densely packed, roughly spherical groups of hundreds of thousands of older stars.

star cluster:  (Definition pending).

Definition 2 in Meteorology is:  Fog or low cloud.  Source:  Practical Standard Dictionary

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Associations with the noun nebula, Definition 2, are:

Definition 3 in Pathology is:  A speck on the cornea; visual opacity.  Source:  Practical Standard Dictionary

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Associations with the noun nebula, Definition 3, are:

nebulae is the plural form.

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