Definition of Coalsack in English:

Coalsack

Syllabification: Coal·sack
Pronunciation: /ˈkōlˌsak
 
/
(the Coalsack)
Astronomy
A dark nebula of dust near the Southern Cross that gives the appearance of a gap in the stars of the Milky Way.

Definition of Coalsack in:

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Word of the day glee
Pronunciation: glē
noun
great delight