Usually means: Dark nebula obscuring background stars.
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We found 13 dictionaries that define the word coalsack:

General (11 matching dictionaries)
  1. Coalsack: Oxford Learner's Dictionaries
  2. Coalsack: American Heritage Dictionary of the English Language
  3. coalsack: Collins English Dictionary
  4. Coalsack: Wordnik
  5. Coalsack, coalsack: Wiktionary
  6. Coalsack: Webster's New World College Dictionary, 4th Ed.
  7. Coalsack: Infoplease Dictionary
  8. Coalsack: Dictionary.com
  9. Coalsack: Wikipedia, the Free Encyclopedia
  10. coalsack: FreeDictionary.org
  11. Coalsack: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Coalsack: Encyclopedia

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

Definitions from Wiktionary (Coalsack)

noun:  A sack for carrying coal.
noun:  (astronomy) Any of the spaces in the Milky Way which are very black, owing to the nearly complete absence of stars.
noun:  The dark nebula near the constellation of the Southern Cross.

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