Usually means: Early stage of star formation.
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We found 15 dictionaries that define the word protostar:

General (10 matching dictionaries)
  1. protostar: Merriam-Webster
  2. protostar: Oxford Learner's Dictionaries
  3. protostar: Collins English Dictionary
  4. protostar: Wordnik
  5. protostar: Wiktionary
  6. protostar: Webster's New World College Dictionary, 4th Ed.
  7. protostar: Infoplease Dictionary
  8. protostar: Dictionary.com
  9. ProtoStar, Protostar: Wikipedia, the Free Encyclopedia
  10. protostar: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. protostar: Encyclopedia

Science (2 matching dictionaries)
  1. Imagine the Universe! Dictionary (No longer online)
  2. PROTOSTAR: Zoom Astronomy Glossary

Tech (2 matching dictionaries)
  1. High-Energy Astrophysics (No longer online)
  2. JPL Terms (No longer online)

Definitions from Wiktionary (protostar)

noun:  (astronomy) A collection of gas and dust in space with high temperature that usually grows to the point of beginning nuclear fusion and becoming a star.

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