Usually means: Small building blocks of planets.
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We found 21 dictionaries that define the word planetesimal:

General (17 matching dictionaries)
  1. planetesimal: Merriam-Webster.com
  2. planetesimal: Oxford Learner's Dictionaries
  3. planetesimal: American Heritage Dictionary of the English Language
  4. planetesimal: Collins English Dictionary
  5. planetesimal: Vocabulary.com
  6. planetesimal: Wordnik
  7. planetesimal: Wiktionary
  8. planetesimal: Webster's New World College Dictionary, 4th Ed.
  9. planetesimal: The Wordsmyth English Dictionary-Thesaurus
  10. planetesimal: Infoplease Dictionary
  11. planetesimal: Dictionary.com
  12. Planetesimal: Wikipedia, the Free Encyclopedia
  13. planetesimal: Rhymezone
  14. planetesimal: Free Dictionary
  15. planetesimal: The Phrontistery - A Dictionary of Obscure Words
  16. planetesimal: Mnemonic Dictionary
  17. planetesimal: Dictionary/thesaurus

Computing (1 matching dictionary)
  1. planetesimal: Encyclopedia

Science (1 matching dictionary)
  1. PLANETESIMAL: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. Planetesimal: Urban Dictionary

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

(Note: See planetesimals as well.)

Definitions from Wiktionary (planetesimal)

noun:  (astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.
adjective:  (astronomy) Being or relating to one of these astronomical objects.

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