Coalsack Definition
 kōlsăk 
    noun
  
 A dark nebula, one of the nearest to Earth, that appears in the southern Milky Way.
 American Heritage 
A prominent dark nebula in the Milky Way near the constellation Crux.
 Webster's New World 
Other Word Forms of Coalsack
Noun
Singular:
 CoalsackPlural:
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