Usually means: Early stage in planet formation.
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We found 11 dictionaries that define the word protoplanet:

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

Computing (1 matching dictionary)
  1. protoplanet: Encyclopedia

Tech (1 matching dictionary)
  1. JPL Terms (No longer online)

(Note: See protoplanetary as well.)

Definitions from Wiktionary (protoplanet)

noun:  An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets

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