Usually means: Early stage of galaxy formation.
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We found 12 dictionaries that define the word protogalaxy:

General (10 matching dictionaries)
  1. protogalaxy: Merriam-Webster
  2. protogalaxy: Oxford Learner's Dictionaries
  3. protogalaxy: American Heritage Dictionary of the English Language
  4. protogalaxy: Collins English Dictionary
  5. protogalaxy: Wiktionary
  6. protogalaxy: Webster's New World College Dictionary, 4th Ed.
  7. protogalaxy: Infoplease Dictionary
  8. protogalaxy: Dictionary.com
  9. ProtoGalaxy, Protogalaxy: Wikipedia, the Free Encyclopedia
  10. protogalaxy: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. protogalaxy: Encyclopedia

Science (1 matching dictionary)
  1. Protogalaxy: Extragalactic Astronomy

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Definitions from Wiktionary (protogalaxy)

▸ noun:  A cloud of gas which is starting to form a galaxy.

Similar:
protogroup, galactogenesis, metagalaxy, galaxy group, hypergalaxy, group, galaxy cluster, Local Group, green pea galaxy, galcon, more...

Adjectives:
gaseous, original, spherical, massive, single

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Similar:
protogroup, galactogenesis, metagalaxy, galaxy group, hypergalaxy, group, galaxy cluster, Local Group, green pea galaxy, galcon, more...

Adjectives:
gaseous, original, spherical, massive, single



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